The two formulas most owners shortlist for a delicate dog: Purina Pro Plan Sensitive Skin & Stomach (salmon/rice) versus Wellness CORE Original. They solve different problems — this file settles which dog needs which.
| Item | Detail |
|---|---|
| Approach | Pro Plan SSS: salmon + rice, moderate protein (26%) | CORE: turkey/chicken, high protein (34%), grain-free |
| Omega-3 guarantee | Pro Plan: labeled EPA/DHA | CORE: present, not guaranteed at dose |
| Grain status | Pro Plan: grain-inclusive | CORE: grain-free (legume-heavy) |
| Cost per day (40 lb dog) | Pro Plan: ~$2.10–2.60 | CORE: ~$2.50–3.00 |
| Best fit | Pro Plan: itchy or soft-stooled dogs | CORE: healthy, highly active dogs |
The verdict by dog type
For the actual sensitive-stomach dog, Pro Plan SSS wins: rice-based digestibility, guaranteed omega-3s for the skin half of the problem, and 20+ years of feeding-trial backing. CORE is a great formula for a different dog — the healthy athlete — but its legume-heavy grain-free build and higher fat offer nothing to a sensitive gut and can aggravate one. Wellness’s own Sensitive Stomach variant (not CORE) is the fairer matchup.
What the label fight hides
CORE’s 34% protein beats 26% on paper, but protein percentage is not a therapy for digestive trouble — digestibility and ingredient tolerance are. Pro Plan’s guaranteed omega dose is the only label claim here with a clinical mechanism behind itchy dogs. Full brand context: Pro Plan and Wellness CORE; other matchups in the comparison desk.
FAQ
Which is better for itchy skin?
Pro Plan SSS — its guaranteed EPA/DHA dose has the mechanism; CORE Original carries no comparable guarantee.
Which is better for a muscular, active dog?
CORE Original: higher protein and calorie density fit hard-keepers, assuming no digestive issues.
Related reading: Pro Plan file · Wellness CORE file · More comparisons · Sensitive stomach files