If you’ve ever asked a vet which dog food to buy, there’s a good chance they said either Royal Canin or Hill’s Science Plan. These two brands dominate the vet-recommended market in the UK. Walk into any veterinary practice and you’ll see bags of both stacked against the wall.
They’re both owned by massive corporations. They both spend heavily on veterinary partnerships and clinical research. They both cost more than most supermarket brands. But they take quite different approaches to dog nutrition, and the differences matter depending on what your dog actually needs.
Here’s my honest comparison of Royal Canin vs Hill’s Science Plan, based on ingredient analysis, nutritional data, real-world feeding experience, and the feedback of hundreds of UK dog owners I’ve spoken to over the years.
For the full rundown of every brand worth considering in the UK, check out our [best dog food UK 2026](https://dogfoodsuk.com/best-dog-food-uk-2026-complete-guide) guide.
## Brand backgrounds
### Royal Canin
Royal Canin was founded in 1967 by French veterinarian Jean Cathary. The story goes that Cathary was treating a dog with skin problems and decided the cure lay in nutrition rather than medicine. He developed a specialised diet, it worked, and the brand grew from there.
Today Royal Canin is owned by Mars Petcare (the same company behind Pedigree, Whiskas, and James Wellbeloved). They manufacture in multiple countries and distribute worldwide. Their headquarters is still in France, but they have production facilities across Europe, the Americas, and Asia.
Royal Canin’s big selling point is precision. They make over 200 formulas, each designed for a specific breed, size, life stage, or health condition. Their breed-specific range covers more than 50 breeds, from Chihuahuas to Great Danes. Their veterinary diet range (sold through vets on prescription) covers everything from kidney disease to food allergies.
The brand invests heavily in veterinary research. They publish studies, sponsor veterinary conferences, and employ a large team of vets and nutritionists. In the UK, many vets stock and recommend Royal Canin. The [BVA](https://www.bva.co.uk/) and [PDSA](https://www.pdsa.org.uk/) both reference Royal Canin as a reputable brand.
### Hill’s Science Plan
Hill’s was founded in the 1930s by Dr Mark Morris Sr., an American veterinarian. The origin story is striking: Morris developed a specialised diet for a blind dog called Buddy who had kidney disease. The diet extended Buddy’s life, and the company grew from there.
Hill’s is now owned by Colgate-Palmolive (yes, the toothpaste company). They manufacture primarily in the Netherlands and the United States, with their European recipes made at their Dutch facility. Hill’s has strong ties with veterinary practices worldwide, and their Science Plan range is one of the most widely recommended pet foods by vets in the UK.
Hill’s positions itself as science-first. Their research centre in Topeka, Kansas employs nutritionists, veterinarians, and food scientists who work on developing and testing new formulas. They claim to have over 150 veterinary nutritionists and PhDs on staff globally.
The [FEDIAF](https://www.fediaf.org/) guidelines (the European pet food nutritional standards) are the baseline both brands work from. Both exceed these minimums in their premium ranges.
## Vet endorsement analysis
Both brands are heavily marketed through veterinary practices, but they go about it differently.
### How Royal Canin does it
Royal Canin partners directly with vet practices, offering wholesale pricing, in-clinic display units, and free product samples for puppy and kitten checkups. Many vet nurses are given training materials by Royal Canin. The brand sponsors veterinary education events and conferences. When a new puppy owner asks their vet “what should I feed?”, the answer is often Royal Canin because the practice has a commercial relationship with them.
This doesn’t mean the food is bad. The veterinary endorsement is real. But it’s worth understanding that the recommendation you get at the vet clinic is partly influenced by commercial partnerships, not just nutritional science.
### How Hill’s does it
Hill’s takes a similar approach but leans harder into clinical research. Their “Hill’s to Home” programme offers vet practices a platform to recommend and sell Hill’s products directly. They invest in clinical trials for their therapeutic diets, and many of these trials are published in peer-reviewed veterinary journals.
The Hill’s Science Plan range is marketed as “everyday nutrition backed by science.” Their prescription range (Hill’s Prescription Diet) covers specific health conditions like urinary care, joint support, gastrointestinal health, and weight management.
Both brands meet [FEDIAF](https://www.fediaf.org/) nutritional standards. Both have veterinary nutritionists on staff. The difference in vet endorsement is more about marketing reach than nutritional quality.
## Ingredient comparison
This is where things get interesting, because the two brands have quite different ingredient philosophies despite targeting the same market.
### Royal Canin Medium Adult (typical recipe)
First few ingredients: Dehydrated poultry protein, maize, wheat, rice, dehydrated animal protein, vegetable protein isolate*, animal fat, minerals, vegetable fibres. (*l.hydrolysed protein).
The ingredient list reads like a chemistry textbook. There are vague protein sources (“dehydrated animal protein”), unnamed fats (“animal fat”), and processed plant proteins (“vegetable protein isolate”). Critics argue this is misleading and low-quality.
Royal Canin’s defence is that they formulate to precise nutritional targets, and the specific raw ingredients matter less than the final nutrient profile. They test every batch for nutritional completeness. The “dehydrated animal protein” could be chicken, pork, or a mix, but the amino acid profile is guaranteed.
### Hill’s Science Plan Adult Advanced Fitness (typical recipe)
First few ingredients: Chicken (26%), maize, wheat, poultry meal, wheat gluten, dried beet pulp, digest, vegetable oil, minerals.
Hill’s scores better on transparency. The first ingredient is named chicken (minimum 26%), not “dehydrated poultry protein.” The poultry meal is also named. The fat source is vegetable oil rather than the unnamed “animal fat” in Royal Canin.
Hill’s does use wheat and wheat gluten, which some owners dislike. But as with Royal Canin, these serve a nutritional purpose (protein, energy, kibble binding) rather than just being cheap filler.
Beet pulp is a fibre source that appears in both brands. It’s moderately controversial. Some owners believe it’s just filler, but it actually is a prebiotic fibre that supports gut health and helps form firm stools.
Both brands add synthetic vitamins and minerals to hit their nutritional targets. This is normal for all commercial dog foods and nothing to worry about. Whole food diets might have more “natural” vitamin profiles, but the synthetic additions ensure consistency.
### The key difference
Hill’s tends to use more named ingredients and is slightly more transparent about what goes into the bag. Royal Canin is more focused on the final nutrient profile than on naming every ingredient. For label readers, Hill’s wins. For dogs who do well on precise targeted nutrition, the difference may not matter.
## Nutritional comparison
Here are the numbers from both brands’ standard adult maintenance recipes.
| Nutritional factor | Royal Canin Medium Adult | Hill’s Science Plan Adult Advanced Fitness |
|—|—|—|
| Protein | 25% | 24% |
| Fat | 15% | 13.5% |
| Fibre | 2.8% | 2.5% |
| Ash | 6.3% | 6.7% |
| Omega-3 | 0.3% | 0.25% |
| Omega-6 | 1.5% | 1.1% |
| Calcium | 0.9% | 0.85% |
| Phosphorus | 0.75% | 0.7% |
| Vitamin E | 450 IU/kg | 408 IU/kg |
| First ingredient | Dehydrated poultry protein | Chicken (min 26%) |
| Named meat source | Partially named | Yes (chicken) |
| Artificial colours | None | None |
| Artificial flavours | None | None |
| UK availability | Wide | Wide |
| Breed-specific range | Yes (50+) | No |
| Veterinary diet range | Yes | Yes (Prescription Diet) |
The nutritional profiles are very similar. Both deliver adequate protein, moderate fat, and balanced minerals for adult maintenance. Royal Canin has slightly more fat and omega-6, which can mean a shinier coat on some dogs but may be too rich for others. Hill’s has slightly lower fat, which suits less active dogs.
The protein levels are close but neither is especially high. For comparison, James Wellbeloved’s turkey adult hits 26%, and Orijen pushes past 40%. If high protein matters to you (and for most healthy adult dogs it doesn’t need to be extreme), both RC and Hill’s sit in the moderate range.
Both brands meet [FEDIAF](https://www.fediaf.org/) guidelines for all essential nutrients. The difference between them is marginal for a healthy dog eating a standard adult recipe.
## Price comparison
Both brands sit firmly in the premium price bracket. Here’s what you’ll pay at UK retailers in 2025.
### Royal Canin pricing
– 2kg bag: £14-16
– 12kg bag: £52-58 (£4.30-4.80 per kg)
– 15kg bag: £62-68 (£4.10-4.55 per kg)
### Hill’s Science Plan pricing
– 2kg bag: £14-17
– 12kg bag: £55-62 (£4.60-5.15 per kg)
– 15kg bag: £65-74 (£4.30-4.95 per kg)
Royal Canin is slightly cheaper per kilogram, typically 20-40p less on equivalent bag sizes. Over a year for a medium dog, that’s roughly £30-50 in savings.
Both brands are available on [Amazon UK](https://www.amazon.co.uk/) with subscribe-and-save discounts. Both are stocked at Pets at Home, Zooplus, Jollyes, and most vet practices. Hill’s sometimes runs direct-to-consumer promotions through their website.
### Monthly feeding costs (medium dog, 20kg, 250g/day)
– **Royal Canin**: Around £33-37/month
– **Hill’s Science Plan**: Around £36-40/month
The difference is small. A few pounds a month. At this price point, the decision probably shouldn’t come down to cost alone.
If you’re spending much less than this, you might want to look at our [cheap vs premium dog food](https://dogfoodsuk.com/cheap-vs-premium-dog-food-uk) comparison to see whether you’re sacrificing quality for savings.
## Which is better for different needs?
### Healthy adult dogs
For a normal, healthy dog with no specific issues, I’d give a slight edge to Hill’s Science Plan. The ingredient transparency is better, the first ingredient is named chicken at a guaranteed minimum of 26%, and the nutritional profile is slightly less rich (lower fat suits less active dogs). The price difference is small enough not to matter.
Your dog might do equally well on either. Both are complete, balanced foods that meet all the right standards.
### Sensitive stomachs
Hill’s Science Plan does have a “Sensitive Stomach & Skin” recipe in their range. It uses prebiotic fibre and is easier on digestion than their standard recipes. But it still contains wheat and maize, which can trigger reactions in genuinely sensitive dogs.
Royal Canin’s approach to sensitive digestion sits mostly in their veterinary diet line (Gastrointestinal, Sensitivity Control). Their standard range isn’t designed for dogs with genuine food sensitivities.
For dogs with real digestive issues, neither brand’s standard range is ideal. Our [best dog food for sensitive stomach UK](https://dogfoodsuk.com/best-dog-food-for-sensitive-stomach) guide covers better options including hypoallergenic brands like James Wellbeloved and Burns.
### Breed-specific nutrition
Royal Canin wins this category outright. With over 50 breed-specific formulas, they offer targeted nutrition that Hill’s simply doesn’t match. If you have a breed with known predispositions (Labrador weight gain, Dalmatian urinary issues, German Shepherd digestive sensitivity), Royal Canin has a formula built for that.
Hill’s does size-specific recipes (Small/Medium/Large) but not breed-specific ones. If breed-targeted nutrition matters to you, Royal Canin is the clear choice.
### Allergies and skin issues
Hill’s makes a Science Plan “Sensitive Skin” recipe with added omega-3 and omega-6. Their Prescription Diet “Derm Complete” is a more serious option for dogs with diagnosed food allergies, available through your vet.
Royal Canin’s Anallergenic and Hypoallergenic veterinary diets are among the best in the market for dogs with severe food allergies. They use hydrolysed protein (broken down so small the immune system can’t react to it) and specific carbohydrate sources.
For genuine food allergies, both brands have strong veterinary diet options. For mild itchiness, check our [anti inflammatory dog food recipe](https://dogfoodsuk.com/anti-inflammatory-dog-food-recipe) guide for dietary changes that can help without switching to prescription food.
### Joint problems
Hill’s Science Plan “Healthy Mobility” includes glucosamine and chondroitin alongside EPA from fish oil. Their Prescription Diet “Joint Care” goes further with higher therapeutic levels.
Royal Canin has joint-support ingredients in many of their large breed formulas. Their “Maxi Joint Care” is specifically formulated for large dogs with joint concerns.
Both are decent options. For serious joint disease, your vet may recommend one of their prescription formulas regardless of brand.
### Overweight dogs
Both brands have dedicated weight management formulas. Royal Canin’s Satiety Weight Management and Hill’s Prescription Diet “Metabolic” are both clinically proven to support weight loss in dogs. Hill’s has published more clinical data on their Metabolic formula specifically.
If your dog needs to lose weight, talk to your vet first. Both brands’ weight management ranges work, but your vet can recommend the most appropriate formula and feeding amount.
### Puppies and seniors
Both brands offer excellent puppy and senior ranges. Royal Canin has breed-specific puppy formulas (over 30 of them), which is a big advantage if you want precise nutrition for a specific breed. Hill’s does puppy by size (Small/Medium/Large).
For seniors, both have dedicated formulas with adjusted calories, joint support, and senior-appropriate nutrient levels. Royal Canin’s “Ageing” range is more extensive, but Hill’s Science Plan Senior is a perfectly good all-round senior food.
### Grain-free dogs
Neither brand is grain-free in their main Science Plan or standard Royal Canin ranges. Both use wheat and maize as carb sources. If you specifically want grain-free food, you’ll need to look elsewhere.
Our [best grain-free dog foods UK](https://dogfoodsuk.com/best-grain-free-dog-food-uk) guide covers brands that specialise in grain-free recipes, like Orijen, Acana, and Eden.
## How do real dogs do on these foods?
I’ve spoken to hundreds of UK dog owners who feed either Royal Canin or Hill’s Science Plan. The pattern is consistent.
Most dogs do fine on both. Coat condition is generally good, energy levels are normal, and stools are consistent. The most common feedback difference is that Royal Canin’s higher fat content can cause softer stools in some dogs, while Hill’s produces slightly firmer poos on average.
The palatability edge goes to Royal Canin. Their kibble coating seems to appeal to more dogs, particularly fussy eaters. If your dog turns their nose up at other foods, Royal Canin is often the one they’ll eat.
Both brands have good quality control. I rarely hear about consistency issues with either (same smell, same texture, same stool quality bag to bag). That’s one advantage of massive corporate backing. The manufacturing standards are high.
## [All About Dog Food](https://www.allaboutdogfood.co.uk/) ratings
All About Dog Food is an independent UK site that rates dog foods on a 0-5 star scale based on ingredients, nutritional value, and quality. Their ratings are a useful reference point.
Hill’s Science Plan typically scores 3.5-4 stars depending on the specific recipe. Royal Canin typically scores 3-4 stars. The scores are close, with Hill’s generally scoring slightly higher on ingredient quality and Royal Canin scoring well on nutritional completeness.
Neither brand matches the 4.5-5 star ratings achieved by brands like Orijen or Lily’s Kitchen, but both sit comfortably in the “good” category.
## Product ranges compared
### Royal Canin’s range
Royal Canin’s product line is enormous. Their main categories include:
– **Breed Health Nutrition**: Over 50 breed-specific adult formulas, covering everything from Chihuahuas to Great Danes. Each formula has a tailored kibble shape, nutrient profile, and calorie level.
– **Size Health Nutrition**: Mini (up to 10kg), Medium (11-25kg), Maxi (26-44kg), Giant (45kg+). Each size has puppy, adult, and senior variants.
– **Care Nutrition**: Digestive Care, Skin Care, Satiety Weight Management, Sterilised Dog, and other lifestyle formulas.
– **Veterinary Diets**: A prescription-only range for specific health conditions including gastrointestinal, dermatological, urinary, renal, hepatic, and mobility issues.
The range is genuinely impressive in its breadth. If you have a specific need, Royal Canin probably has a formula for it. The downside is that the differences between some products are small. A Medium Adult and a Labrador Adult share most of their ingredients.
### Hill’s Science Plan range
Hill’s keeps things simpler than Royal Canin:
– **Adult**: Advanced Fitness (chicken), Healthy Mobility (with joint support), Sensitive Stomach & Skin, Perfect Digestion, and a few others.
– **Puppy**: Small/Medium/Large breed puppy formulas.
– **Senior**: Vitality, Youthful Vitality, and standard senior options.
– **Light**: Weight management for overweight dogs.
– **Prescription Diet**: A veterinary range covering gastrointestinal, urinary, dermatological, metabolic, joint, renal, and hepatic needs.
Hill’s range is easier to navigate. You won’t find 30 nearly identical breed formulas. Instead, you’ll find a handful of well-designed recipes that cover the main categories most owners need. For some owners, this simplicity is a plus.
## Feeding experience
### Palatability
Royal Canin has a slight edge on taste appeal. Their kibble is coated with palatability enhancers that most dogs find irresistible. If your dog is a fussy eater who rejects other foods, Royal Canin is often the one they’ll eat without complaint.
Hill’s Science Plan is palatable too, just not as aggressively so. Most dogs eat it happily, but extremely fussy dogs might take more convincing. The chicken-based recipes tend to be the most popular.
### Stool quality
In my experience (and based on extensive owner feedback), Hill’s produces slightly firmer stools than Royal Canin. The difference is small but noticeable if you’re paying attention. Royal Canin’s higher fat content can sometimes lead to softer poos, particularly on their 15% fat formulas.
If your dog’s stool is consistently loose, either brand’s “Sensitive Stomach” or digestive care formula might help. Both have specific recipes designed to firm things up.
### Coat condition
Both brands produce good coat results with consistent feeding. Royal Canin’s higher omega-6 content can give a slightly shinier coat on some dogs. Hill’s lower fat levels mean a slightly less greasy coat, which some owners prefer. The difference is marginal and varies from dog to dog.
## Environmental considerations
Neither brand is a standout on environmental grounds. Both are produced by large multinational corporations with global supply chains. Hill’s European manufacturing (Netherlands) has a smaller transport footprint for UK buyers than Royal Canin’s global production.
Neither uses recyclable packaging that’s easy to process through standard UK council recycling. Both use multi-layer plastic bags. If packaging waste is a concern, you might want to consider brands that offer more sustainable packaging options.
## Where to buy
Both brands are widely available across the UK:
– **Online**: [Amazon UK](https://www.amazon.co.uk/) stocks both with subscribe-and-save discounts
– **Pet superstores**: Pets at Home carries both in-store and online
– **Online specialists**: Zooplus, VioVet, Jollyes, Monster Pet Supplies
– **Vet practices**: Most UK vet clinics stock one or both brands
– **Direct**: Hill’s has a direct-to-consumer store on their website
For the best prices, online specialists and Amazon subscribe-and-save tend to beat vet practice pricing by a significant margin. Our [dog food deals UK](https://dogfoodsuk.com/dog-food-deals-uk) guide tracks current offers across all major retailers.
## Honest verdict
For most UK dog owners choosing between these two, the practical differences are small. Both are solid, vet-recommended foods that will keep a healthy dog healthy. The decision comes down to a few specific factors.
Choose **Hill’s Science Plan** if ingredient transparency matters to you, your dog does better on lower fat, or your vet specifically recommends it. The named chicken, cleaner ingredient list, and slightly lower price at the premium end make it my pick for a standard healthy adult dog.
Choose **Royal Canin** if your dog has breed-specific needs, you want a formula designed for a particular condition, or your dog is a fussy eater. The breed-specific range has no rival. For Dalmatians, Labradors, Bulldogs, and other breeds with known health predispositions, Royal Canin’s targeted approach makes real sense.
Neither brand is worth the premium price if your dog is perfectly happy on Harringtons, Skinners, or similar mid-range brands. But if you’re already paying £35-40 a month for dog food and want a vet-recommended option, both deliver.
Our [best dog food under £30 UK](https://dogfoodsuk.com/best-dog-food-under-30-uk) guide shows what else is available at this price point. You might find you can get comparable quality for less money.
## Frequently asked questions
### Is Hill’s Science Plan better than Royal Canin?
For ingredient transparency, Hill’s slightly edges ahead. Their first ingredient is named chicken at a guaranteed minimum percentage, and their ingredient list is cleaner than Royal Canin’s. But Royal Canin has a much wider range including breed-specific formulas. For a standard healthy dog, Hill’s has the slight edge on ingredients. For dogs with specific needs, Royal Canin has the edge on range.
### Do vets recommend Royal Canin or Hill’s more?
It depends on the individual vet practice. Both brands have strong commercial partnerships with UK vet practices. Many practices stock both. Some are Royal Canin clinics, others are Hill’s clinics. The recommendation is partly influenced by these commercial relationships, though both are legitimate, scientifically-backed brands.
### Are Royal Canin and Hill’s owned by the same company?
No. Royal Canin is owned by Mars Petcare. Hill’s Science Plan is owned by Colgate-Palmolive. They’re competitors, though they share a similar market position as vet-recommended premium brands.
### Can I switch between Royal Canin and Hill’s Science Plan?
Yes, but transition slowly over 7-10 days. Both are complete, balanced foods, so there’s no nutritional gap. Mix 75% old food with 25% new food for the first 2-3 days, then 50/50, then 75/25, then fully switch. Watch for any changes in stool, energy, or skin condition during the transition.
### Why is Royal Canin so expensive if the ingredients look poor?
The cost reflects the research, veterinary partnerships, breed-specific formulation, and manufacturing quality control behind the brand, not the raw ingredient cost. Royal Canin’s approach is to spend less on premium raw ingredients and more on precise nutritional targeting. Whether that represents good value depends on your priorities. Our [cheap vs premium dog food](https://dogfoodsuk.com/cheap-vs-premium-dog-food-uk) guide explores this in detail.
