Hill's Sensitive Stomach vs Purina Pro Plan Sensitive: Which Works Better?
Hill's Science Diet Adult Sensitive Stomach & Skin Salmon & Brown Rice Recipe
Full review →Purina Pro Plan Adult Sensitive Skin & Stomach Salmon & Rice Formula
Full review →The short answer. Purina wins this one by three points despite being the cheaper food: 26% protein against 20.5%, $0.54 less per pound, and 20,137 owner ratings against Hill's 495. Hill's still holds the stronger feeding-trial evidence at 92 on standards, which is the reason to pick it when the case is genuinely reactive.
Side by side
Every number below comes from the manufacturer's current label or current US retail listings, scored on the same 6-dimension model. Shaded cells mark the better value on that row.
| Attribute | Hill's Science Diet Adult Sensitive Stomach & Skin Salmon & Brown Rice Recipe | Purina Pro Plan Adult Sensitive Skin & Stomach Salmon & Rice Formula |
|---|---|---|
| Overall score | 80 / 100 | 83 / 100 |
| Protein quality & source (30%) | 73 | 82 |
| Ingredient transparency (20%) | 70 | 70 |
| Nutritional standards (18%) | 92 | 90 |
| Recall history & safety (14%) | 80 | 84 |
| Value for money (10%) | 94 | 97 |
| Owner & pal feedback (8%) | 91 | 90 |
| Protein (as fed) | 20.5% | 26.0% |
| Protein (dry matter) | 22.9% | 29.5% |
| Fat (min) | 14.0% | 16.0% |
| Fibre (max) | 3.0% | 4.0% |
| Moisture | 10.5% | 12.0% |
| Calorie density | 3,813 kcal/kg | 3,903 kcal/kg |
| Price per lb | $3.13/lb | $2.59/lb |
| Price per 1,000 kcal | $1.81 | $1.46 |
| Owner rating | 4.6/5 (495 ratings) | 4.5/5 (20,137 ratings) |
| First ingredient | Salmon | Salmon |
| Form | Dry (kibble) | Dry (kibble) |
| Life stage | Adult maintenance | Adult maintenance |
| Best for | Dogs with genuinely reactive digestion where the strongest feeding-trial evidence is worth a premium | Adult dogs with itchy skin or loose stools where a common protein is not the trigger |
Where the difference actually comes from
These are near-identical products on paper — salmon and rice, sensitive stomach and skin positioning, both mid-priced — and the outcome is unusually clear because one of them has real-world evidence at scale. Purina Pro Plan Sensitive Skin & Stomach carries 20,137 ratings at 4.5/5. Hill's Sensitive Stomach & Skin has 495. For a claim about digestion, that sample difference matters more than any spec sheet.
Purina also wins on the nutrient panel itself: 26% protein against 20.5%, and 3,903 kcal/kg against 3,813. Both start with salmon. Purina is $2.59/lb against Hill's $3.13/lb and takes 97 on value against 94. On every measurable axis except standards, Purina is ahead.
Hill's case is narrower but real: a 92 on standards, the highest of any sensitive-skin formula here, reflecting feeding-trial work behind the claim. If your dog has a genuinely reactive digestion and the cheaper option has not worked, that evidence is what you are buying — not protein percentage.
Which one should you buy?
Choose Hill's Pet Nutrition if
Your dog has a genuinely reactive digestion where feeding-trial evidence matters more than owner consensus, or you have already tried the mainstream option without success.
Choose Purina Pro Plan if
You want the better protein-to-price ratio and the largest evidence base of real owners behind a sensitive-stomach claim.
Pros and trade-offs
Hill's Pet Nutrition
What owners and our testing liked
- Salmon first with brown rice, and Hill's ActivBiome+ prebiotic blend for the gut microbiome
- Feeding-trial validated - the strongest evidence base of any sensitive-stomach food here
- 20.5% protein with 14% fat and only 3% fiber, a gentle profile for a reactive gut
- Omega-6 and vitamin E levels are specified for skin and coat support
Trade-offs
- About $1.81 per 1,000 kcal - roughly 25% more per calorie than Pro Plan Sensitive
- Corn protein meal sits fifth, adding plant protein
- Smaller review base than the Purina equivalent (about 495 ratings)
Purina Pro Plan
What owners and our testing liked
- Real salmon first with rice and barley - a genuinely short, digestible carbohydrate base
- Feeding-trial validated, which is uncommon in the sensitive-skin category
- 4.5/5 across roughly 20,100 Chewy ratings, the largest review base in this ranking
- About $1.46 per 1,000 kcal, well under most competitors in this niche
Trade-offs
- Canola meal in the fourth slot contributes plant protein
- Contains fish and canola; not a true limited-ingredient diet for elimination trials
- 12% moisture is high, and a minority of owners report the salmon smell is strong
Frequently asked questions
Is salmon better than chicken for a sensitive stomach?
Not inherently. Most food sensitivities in dogs are to the protein the animal has been eating longest, which is usually chicken simply because it is most common. Switching to salmon helps when chicken was the trigger; it does nothing if the trigger was something else.
How long before I see improvement?
Give a full six to eight weeks on the new food with nothing else changing — no treats, no table food, no other protein sources. Digestive and skin responses are slow, and owners who switch again at two weeks rarely learn whether the first food worked.
Do I need a prescription diet instead?
If symptoms are severe, persistent, or include weight loss, vomiting or bloody stool, see your vet rather than cycling through over-the-counter foods. These two are maintenance foods for mild reactivity, not treatment for inflammatory bowel disease or a diagnosed allergy.
Want to compare more than two? Use the comparison tool — up to four foods side by side. Individual animals vary; if your pet has a diagnosed condition, confirm the choice with your veterinarian.