AcanaWholesome Grains, Sea to Stream Fish & Grains Recipe

A tall perennial grass, dried and ground, used as an insoluble fiber. It does the same job as cellulose, bulking stool and diluting calories; it is grown for the purpose and lets a label avoid the word cellulose. It passes through undigested and supplies fiber only. It usually appears in weight-control or hairball formulas, or in grain-free foods that need a fiber source.

A B-vitamin relative added to nearly every complete food because animals need more than the base ingredients supply. It supports liver function and cell membranes. Seeing it on a label is normal and reassuring rather than a concern.

An amino acid cats cannot make in sufficient quantity and must eat, or they develop heart disease and blindness. It is in every complete cat food by law of nutrition, not by choice. Dogs make their own, but it is added to many dog foods as a precaution after a federal investigation into diet-associated heart disease in dogs. Its presence on a dog food label is a good sign, not a warning.

A fat-soluble antioxidant that protects cells and the fats in the food itself. It is in nearly every complete food, both as a nutrient and, under the name mixed tocopherols, as the natural preservative that keeps fat from going rancid. Deficiency is rare in pets eating a complete diet. Nothing to worry about on a label, and a sign the maker is preserving with vitamin E rather than synthetic chemicals.

A dried seaweed added as a natural source of iodine and trace minerals. Iodine is needed for thyroid function, and kelp is one of the few whole-food sources of it. The iodine content of kelp varies a great deal between harvests, so it has to be tested and dosed carefully, and the label will not tell you whether it was. Pets with thyroid disease should get the vet's view on foods that use kelp as the main iodine source.

A zinc source. Zinc is essential for skin, coat, immunity and wound healing, and deficiency shows up first as crusty skin. Some Arctic breeds absorb it poorly and need more. Sulfate and oxide are inorganic; proteinate or chelate is bound to protein, which brands present as better absorbed. Any of them is normal. Not an allergen.

A potassium source and an electrolyte. Potassium keeps muscles and nerves working, including the heart, and cats lose more of it than dogs do. It also stands in for part of the salt in foods that are formulated lower in sodium. A routine additive with no allergy or safety concern at food levels.

Vitamin B3. Dogs can make some from the amino acid tryptophan; cats cannot make enough and must get it from food, which is one of many reasons cat food and dog food are not interchangeable. Water-soluble and safe at food levels. Expected on every complete food label.

Vitamin B1, essential for nerves and energy metabolism, and the vitamin most often behind cat food recalls. It is destroyed by heat and by some preservatives, so canned foods in particular must add it back. Cats are especially sensitive to running short. Its presence is expected; its absence from a cooked food would be a red flag.

Vitamin B2, used to turn food into energy. Present in meat and dairy but partly lost in cooking, so manufacturers top it up. Water-soluble and safe at the levels used in food. Its presence tells you the food was formulated to a complete nutrient profile, not that anything unusual is going on.

Vitamin B5 in its stable added form (the d- prefix just names the active version). It is needed to turn fats and carbohydrates into energy. Widely available in meats and grains, topped up to guarantee the level. Safe, expected, and irrelevant to allergies.

Vitamin B6 in its stable, added form. It is central to protein metabolism, and cats need proportionally more of it than dogs because their diet runs so high in protein. Water-soluble and safe at food levels. A normal line on any complete food.

Vitamin B9, needed for cell division and healthy blood. Standard fortification in complete foods for dogs and cats. Water-soluble, no toxicity concern at food levels. Its main relevance to a shopper is none: it is there because the recipe was balanced properly.

Needed for nerve function and making red blood cells. It occurs naturally only in animal tissue, so it is added to almost every food to guarantee the level. Water-soluble, so excess passes out in urine. Cats and dogs with chronic gut disease can run low even on a good diet, which is a vet conversation rather than a food choice.

A copper source. Copper is essential in small amounts for blood, connective tissue and coat color. Some veterinary nutritionists have questioned whether modern dog foods carry more copper than dogs need, and a few breeds (Bedlington Terriers, Labradors among them) are prone to storing it in the liver. For most pets it is a routine additive. If your dog has a diagnosed liver condition, copper level is worth a vet conversation.

A root added for its inulin, a fiber that gut bacteria ferment. A prebiotic feeds the beneficial bacteria in the gut, and the pet gets the benefit second-hand. Studies in dogs show modest changes in gut bacteria and stool quality at the levels used in food. It is safe, and in large amounts can loosen stools, so it appears near the bottom of the list.

Live bacteria added to support digestion, listed by strain name such as Lactobacillus acidophilus or Bacillus coagulans. The difficulty is that most are killed by the heat of cooking and by months on a shelf, so unless the maker coats the kibble after cooking and states a live count on the bag, the listing does not tell you much. Bacillus strains form spores and survive processing better than the others. The strains used are considered safe.

A natural acid, the same one found in citrus, used alongside mixed tocopherols to slow fat from going rancid. It works by binding the trace metals that speed up oxidation. The amounts are tiny and it is one of the most benign preservatives available. A persistent claim links citric acid to bloat in dogs; it rests on one observational study with no mechanism behind it, and most veterinary nutritionists do not consider it supported.