NuloAdvanced All-in-1 Soft Chew Supplements for Dogs

Water added during the making of wet food, listed as 'water sufficient for processing'. It is there to form the gravy or loaf and to cook the ingredients, and it is why wet food is around 75 to 80 percent moisture. For cats, that moisture is the main nutritional argument for wet food, since many cats drink little on their own. It is sometimes called a filler. Wet food cannot be made without it.

A building block of cartilage, usually from shellfish shells, added to joint-support and senior foods. The evidence in dogs is mixed: some trials show modest improvement in arthritis signs, others none, and the dose in a food is typically well below the dose used in those trials. No safety issue at food doses. If joint support is the goal, the amount per cup, stated on the bag, is the number to compare; the ingredient's presence alone says little.

A cartilage component, usually from cattle or chicken cartilage, almost always paired with glucosamine in joint-support foods. The same caveats apply: the evidence in dogs is modest, the dose in a complete food is usually below that used in supplement trials, and the amount on the bag is what to compare. Because it usually comes from chicken or beef cartilage, strict allergy diets may need to check the source.

A heat-stable form of vitamin C. Dogs and cats make their own vitamin C, so it is not an essential nutrient for them. It is added as an antioxidant and, some argue, to support joints and immunity. Harmless at food levels and not a reason to choose or avoid a food.

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.

An iron source. Iron carries oxygen in the blood, and meat supplies much of it, with the mineral supplement making up the rest. Ferrous sulfate is the inorganic form; iron proteinate or chelate is the same mineral bound to a protein fragment, which brands describe as more absorbable. Either is normal. Not an allergen.

A manganese source. Manganese is needed in tiny amounts for bone, cartilage and enzyme function. Sulfate is the inorganic form; proteinate is the mineral bound to protein. The choice between them is a marketing distinction more than a health one for a healthy pet. Expected, safe, not an allergen.

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.

Yeast grown in a selenium-rich medium so the mineral is bound into the yeast's proteins, which is the form found in meat. Selenium is an essential antioxidant mineral that pets need in tiny amounts and that is toxic in large ones. Selenium yeast is absorbed more steadily than sodium selenite, the inorganic alternative, and is the form many nutritionists prefer. Either form is safe at label levels.

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 B vitamin tied to skin and coat quality and to fat and protein metabolism. Gut bacteria make some; food supplies the rest. Raw egg white contains a protein that binds biotin, which is the reason raw-egg diets can cause a deficiency. Safe, expected, and not an allergen.

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.

Dogs and cats cannot make useful amounts of vitamin D from sunlight, so it has to be in the food. It governs calcium and bone health. It is also one of the few vitamins where too much is dangerous: excess vitamin D has caused pet food recalls. The amount is regulated and the presence of D3 on a label is expected. What matters is that the maker gets the dose right, which is a quality-control question, not an ingredient question.

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.

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.

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 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.