Adult Gold

Cholecalciferol is vitamin D3 — the standard, AAFCO-required form of vitamin D in complete dog food, and its presence on a label is expected rather than alarming. Dogs cannot make meaningful vitamin D in their skin from sunlight the way people do, so it has to come from the diet. Two things are worth knowing. D3 is more potent than D2 (ergocalciferol) and has a narrower safety margin — it is the form used in rodenticides. And the real-world risk is manufacturing error, not the ingredient: FDA recalls in 2018–19 found dog foods containing up to 70x the intended vitamin D, causing hypercalcemia, kidney failure and deaths across brands including Hill's, Nutrisca, Sunshine Mills, Kroger and ELM. An ingredient label cannot tell you the amount, only that it is present — so this is flagged for awareness, not as a mark against the food.

⚪ 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.

⚪ Formulation signal. The acceptable middle grade — adequately absorbed, behind zinc proteinate or zinc amino acid chelate, well ahead of zinc oxide. Not a reason to reject a food on its own.

⚪ Formulation signal, not a hazard. Sulfate is the adequate middle grade of mineral — better absorbed than oxide, not as well as a chelate, and mildly pro-oxidant. Iron proteinate or iron amino acid chelate is the upgrade. Seeing sulfates rather than oxides means the manufacturer did not buy the cheapest option available, which is worth knowing.

⚪ Formulation signal. Adequate absorption; manganese proteinate or amino acid chelate is better, manganese oxide is worse. On its own this is unremarkable.

⚠️ 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.

⚪ Synthetic form, generally safe: DL-methionine is a synthetic amino acid added to meet methionine requirements and, in some foods, to acidify urine. It's a legitimate and widely used feed additive with no evidence of harm at label levels. The 'DL-' indicates a racemic mixture — dogs use the L-form directly and convert the D-form, which they do adequately. Flagged as a formulation signal rather than a hazard: its presence usually indicates plant-heavy protein that needed topping up, since meat-based diets generally supply enough methionine on their own.