Pro Plan Sensitive Skin & Stomach Adult Dog Food Lamb & Oat Meal Formula

⚪ Transparency signal: 'natural flavor' in pet food is most often animal digest — hydrolysed animal tissue sprayed on the outside of the kibble to make it palatable. It is not required to name the species. The concern is not toxicity, it is that a bag can list an unnamed animal product and disclose nothing about what it was.

⚪ Safe synthetic at label levels: pyridoxine HCl is synthetic vitamin B6, and it's the standard, effective form used across pet food. Dogs require B6 for protein metabolism and neurotransmitter production, and deficiency causes anaemia and seizures. The reason for noting it at all is that B6 has an unusually narrow window at the top end for a B vitamin: chronic excess causes peripheral neuropathy — nerve damage in the limbs and loss of coordination. That's a concern for over-supplementation, not for its presence in a balanced food.

⚠️ Read this one carefully, because it is flagged for the OPPOSITE reason to every other mineral here. As a form, sulfate is the acceptable middle — chelates absorb best, sulfates adequately, oxides barely at all. Copper sulfate is not a poor form. The concern is TOTAL COPPER LOAD: copper accumulates in the liver, dogs have no good way to dump the excess, and AAFCO deleted the copper maximum in 2007 and still has none. So 'meets AAFCO' tells you nothing about the ceiling. Matters most in copper-predisposed breeds — Bedlington Terrier, West Highland White, Doberman, Labrador, Dalmatian — where the target is under ~1.2mg per 1,000 kcal. Liver enzymes are NOT sensitive early, so normal bloodwork does not rule it out. Demoted from severe to mild on 2026-08-23: the form itself is fine, and scoring it as severe punished a mid-tier food for using an adequate mineral.

Sodium selenite is inorganic selenium, and selenium has one of the narrowest safe ranges of any nutrient. AAFCO sets the adult minimum at 0.35 mg/kg dry matter and the maximum at 2.0 — a window of only about 5.7x. For comparison, most nutrients have margins in the hundreds. That narrowness is precisely why the FORM matters here and matters less elsewhere. Two measured differences separate the forms. ABSORPTION: inorganic selenite is absorbed at roughly 50-60%, against 70-85% for organic selenomethionine and selenium yeast — so more selenite must be added to deliver the same nutrition, eating into an already tight margin. TOXICITY: comparative work found sodium selenite around 2.94x more toxic than selenium yeast, and organic forms test as less toxic than inorganic selenite and selenate generally. Mechanistically, selenomethionine is incorporated into proteins and released under regulation, whereas inorganic selenite generates free radicals during metabolism and causes oxidative stress in liver and kidney tissue; work in Biological Trace Element Research links long-term inorganic accumulation to kidney tubule damage that precedes any visible signs. So the case here is stronger than for most flagged ingredients: worse absorption AND higher toxicity AND the narrowest safety window in the profile. Prefer selenium yeast or selenomethionine.