JustfoodfordogsJoint & Skin Support (Small Box)

A red-meat protein, nutritionally similar to beef and fattier than poultry. The meal form is the concentrated one; fresh pork is mostly water. Pork is less commonly reported as a pet allergen than beef, chicken or lamb, which has made it a useful alternative protein. Pork liver, plasma and fat appear under their own names.

A dark leafy green, dried and added in small amounts, mostly for the vitamins and the look of the ingredient list. Kale is safe for dogs and cats at food levels. Like spinach it contains oxalate, and in quantity it is a consideration for pets prone to calcium oxalate stones, but the fraction of a percent in a complete food is not a factor. At these amounts it is there for the ingredient list and does not change the nutrition of the food.

A vegetable that contributes a little fiber and beta-carotene and a lot of label appeal. In dry food it is usually present in small amounts well down the list. It is not an allergen of concern and not a meaningful protein or calorie source. Fine to see; not a reason to choose one food over another.

A plant source of omega-3 fat (alpha-linolenic acid) and fiber, used in about a third of dog foods for coat and stool quality. Dogs and cats convert plant omega-3 to the useful forms inefficiently, so fish oil does the job better. Flax is not a documented common allergen, though some pets tolerate it poorly, most often as loose stool. Fine in a food; not a reason to prefer it over one using fish oil.