Last updated: 9 September 2026
Royal Canin and Purina Pro Plan both offer many formulas, so this comparison uses Royal Canin Medium Adult and Pro Plan Medium Adult Everyday Nutrition Chicken. Both are sold as complete dry foods for adult medium-sized dogs. Choose by the exact formula, individual suitability and daily feeding cost rather than declaring one brand universally superior.
A dog on a veterinary diet needs a separate discussion with the vet. These retail maintenance foods are not interchangeable with therapeutic products that happen to carry the same manufacturer’s name.
Table of Contents
Compare the actual UK products
| Detail | Royal Canin Medium Adult | Pro Plan Medium Everyday Nutrition Chicken |
|---|---|---|
| Manufacturer’s size scope | Adult dogs 11–25kg | Adult dogs 10–25kg |
| Declared protein | 25% | 26% |
| Declared fat | 14% | 16% |
| Declared crude fibre | 1.4% | 2% |
| Practical next check | Exact pack feeding table and suitability | Exact pack feeding table and suitability |
These are the values on the UK manufacturer pages checked for the named products. They describe the food as supplied and are not a ranking of nutritional quality. A one-point protein difference does not establish better performance, and a higher fat percentage does not automatically make a food inappropriate.
The manufacturers’ age and size categories are product guidance, not a diagnosis of your dog’s needs. Discuss unusual activity, weight changes or health concerns with the vet rather than selecting a category from a number alone.
Read ingredient information with a clear purpose
Pro Plan’s current composition names chicken and also includes dried poultry protein, grains and other ingredients. The chicken headline should not be read as a single-ingredient or grain-free declaration. Royal Canin’s full composition likewise needs reading if a particular ingredient matters to you.
Avoid trying to rank the diets by counting recognisable words. The useful questions are whether the food is complete for the intended dog, whether any necessary ingredient restriction is addressed and whether the manufacturer can answer a specific question clearly.
The dog food guide provides broader context. Neither a breed name nor a familiar premium label removes the need to read the exact pack you are buying.
Compare cost per day, not the shelf ticket
Write down the normal delivered price and the bag weight. Calculate cost per kilogram, then use the suitable daily amount for that recipe to estimate feeding cost. The two foods should not automatically be fed at the same number of grams.
For illustration, a £60 bag weighing 15kg costs £4 per kilogram. At an illustrative 250g per day, that is £1 daily. A £56 bag weighing 14kg also costs £4 per kilogram, but an illustrative 280g daily ration costs £1.12. These are worked examples, not current prices or suggested portions.
Check how delivery, discounts and recurring orders affect the total. A subscription may be convenient, but compare the ordinary ongoing terms and your usage rate. Do not let a first-order discount determine a food choice that will be difficult to afford later.
Keep portions and extras visible
Use the pack’s feeding guidance as a starting point and adjust appropriately for the individual dog with professional advice where needed. Weigh portions. If several people feed the dog, agree who measures meals and records treats so the daily total remains understandable.
Pro Plan’s page supplies calorie information, which can help when comparing rations, but do not convert it into a personalised prescription without considering the dog’s needs. Ask for equivalent information from the manufacturer if it is not clear on another pack.
Chews, toppers and rewards count as food too. A change in body condition after switching may reflect the total amount fed rather than a simple verdict about the brand.
Try a manageable quantity
This article contains Amazon affiliate links. As an Amazon Associate, we earn from qualifying purchases.
Find Royal Canin Medium Adult dry food on Amazon UK and Find Pro Plan Medium Everyday Nutrition Chicken on Amazon UK if both fit your shortlist. Match the full model name, life stage and pack size. These search links do not claim a live best price, specific seller or availability.
A smaller first bag can reduce waste while you assess practical feeding and storage. Follow suitable transition instructions and retain the packaging and batch details. Persistent digestive problems, appetite changes or other symptoms need veterinary assessment rather than repeated trial-and-error switching.
Store the food in the conditions stated by the manufacturer and choose a bag you can use within a sensible opened period. The better choice is the exact complete formula that fits your dog and household consistently, supported by clear portions and a cost you can sustain.