A plain-language reference for what's on your dog or cat's food label. Each entry covers what the ingredient is, why it's used, and whether it's something to look for or something to watch out for.
Want a per-product answer? Scan a label with Pawpoy for a verdict tailored to your specific pet.
Also known as: Dehydrated chicken
Concentrated chicken protein with most moisture removed.
Chicken meal is rendered chicken with water and fat removed, giving roughly 3× the protein density of fresh chicken. A named meal (chicken, lamb, salmon) high on the ingredient list is generally a good sign of protein content for dogs and most cats.
Animal parts other than muscle meat. Quality varies widely.
By-products can include nutritious organs (liver, heart, kidney) or lower-value tissue. Unnamed 'meat by-products' offer no traceability to a single species, which is a concern for pets with protein allergies. 'Chicken by-products' (named) is more transparent than 'meat by-products' (unnamed).
Excellent source of EPA and DHA omega-3 fatty acids.
Omega-3 fatty acids support coat quality, joint health, and cardiovascular function. Named fish oils (salmon, anchovy, sardine) are preferable to unnamed 'fish oil' for quality assurance. Look for a protected (stabilized) oil to prevent rancidity.
Common carbohydrate sources. Safe for most pets, allergenic for a few.
These grains provide energy, fiber, and plant protein and aren't inherently harmful. Overall food allergies affect well under 1% of dogs and cats seen for any reason, and when an allergy is confirmed, the trigger is far more often a protein source (beef, dairy, chicken, lamb) than a grain. The 'grain-free' trend is largely marketing rather than a response to widespread grain sensitivity. Switch only if a vet diagnoses a genuine food allergy through an elimination diet.
Common grain-free carbohydrate substitutes with a DCM association in dogs.
The FDA opened an investigation in 2018 after receiving reports of dilated cardiomyopathy (DCM) in dogs eating grain-free diets high in peas, lentils, and other legumes. The agency closed the investigation in December 2022, concluding there wasn't enough evidence to establish that these diets cause DCM, though the association hasn't been ruled out either. Research into a possible taurine-related mechanism continues outside the FDA. Generally safe in moderation; worth a conversation with your vet when legumes sit in the top 5 ingredients of a grain-free formula without taurine supplementation.
Fiber from sugar beets that supports digestive health.
Beet pulp is a moderately fermentable fiber that promotes healthy stool quality and a balanced gut microbiome. The sugar is fully extracted during processing, so it's not a sweetener.
Seaweed-derived thickener used in wet pet food.
Food-grade carrageenan, the kind used in wet pet food, is GRAS-approved by the FDA. The gastrointestinal inflammation seen in animal studies involved a different, more processed compound called degraded carrageenan (poligeenan), which isn't approved for use in food at all. Some pet owners avoid carrageenan as a precaution and many premium brands have removed it, but the ingredient itself isn't the same substance the inflammation research is about. Pets with IBD or chronic GI issues may still do better on a carrageenan-free formula.
Also known as: Carrageenan-free thickener
Plant-based thickener used as a carrageenan alternative.
Guar gum is derived from guar beans and is well-tolerated by most pets at the low levels used in wet food. It's a common 'clean label' replacement for carrageenan.
Also known as: Butylated hydroxyanisole / hydroxytoluene
Synthetic preservatives flagged for long-term safety concerns.
BHA is listed by the US National Toxicology Program as 'reasonably anticipated to be a human carcinogen,' based on forestomach tumors in rodent studies (dogs and humans don't have a forestomach, so the direct relevance is debated). BHT hasn't received that same classification, but has shown liver and thyroid effects in animal studies at high doses. Both are still legal in pet food, but mixed tocopherols (vitamin E) and rosemary extract are widely used safer alternatives.
Synthetic preservative withdrawn from animal feed use in the EU; still permitted in the US.
Originally developed as a pesticide stabilizer, ethoxyquin is FDA-approved for pet food up to 150 ppm and mainly used to preserve fish meal during shipping. The EU withdrew its authorization as an animal feed additive in 2022; it's still permitted in the US. It doesn't always show up on the label: if a supplier treats fish meal with it before the pet food manufacturer buys the ingredient, it can be present without being declared. Most reputable brands have phased it out voluntarily, but fish-based foods are the ones most likely to carry it, labeled or not.
Also known as: Vitamin E
Natural vitamin E used as a fat preservative.
Mixed tocopherols are the gold-standard natural preservative for pet food fats. They prevent rancidity without the long-term concerns associated with BHA, BHT, or ethoxyquin.
Moisture-retaining additive that's safe for dogs but toxic to cats.
The FDA banned propylene glycol from cat food in 1996 because it causes Heinz body anemia in cats. It is still permitted in dog food at typical levels. Always check the label if you feed a multi-species household.
Allium family, toxic to dogs and cats in any form.
All forms of onion, garlic, leek, and chive cause oxidative damage to red blood cells, leading to anemia. The Merck Veterinary Manual puts garlic at 3 to 5 times more toxic than onion by weight. Effects are cumulative: small daily doses are worse than a one-time exposure. Avoid completely.
Hydrolyzed animal tissue used as a palatability enhancer.
Animal digest is chemically or enzymatically broken down animal tissue sprayed on kibble for taste. Quality and sourcing vary widely. Named digest ('chicken digest') is more transparent than generic 'animal digest.'
Sugar substitute that is highly toxic to dogs.
Even tiny amounts of xylitol cause a rapid insulin release in dogs, leading to hypoglycemia, liver failure, and death. It's common in peanut butter, gum, and some 'sugar-free' human snacks. Never feed those to dogs, and check dental treats carefully.
Essential amino acid for cats; supportive for some dog breeds.
Cats can't make their own taurine, and deficiency causes dilated cardiomyopathy and retinal degeneration. AAFCO-complete cat foods always include it. Some dogs on high-legume grain-free diets have also developed taurine-related heart problems, which is why grain-free dog food labels are worth checking for taurine supplementation.
Joint-support compounds added to senior and large-breed formulas.
These compounds support cartilage health and show up often in senior, large-breed, and joint-support formulas. The therapeutic dose used in veterinary studies is based on body weight, roughly 15 to 30 mg of glucosamine per kg of body weight per day, not the amount per kg of food on the label. Most kibble supplies 250 to 1,500 mg of glucosamine per kg of food, which at typical feeding amounts usually falls short of that target. Glucosamine on a food label is often a marketing signal rather than a treatment: a dog with diagnosed joint disease usually needs a dedicated supplement dosed to their weight.
Inorganic selenium supplement. Effective, but with a narrow safety margin.
Selenium is an essential mineral, but the margin between adequate and toxic levels is narrow. Sodium selenite is the inorganic form most commonly used in pet food. Selenium toxicity (selenosis) causes hair loss, neurological symptoms, and liver damage. Properly formulated foods stay well within safe limits.
Pawpoy reads the full ingredient list and gives you a clear, pet-specific safety read in seconds. No chemistry degree needed.
Start scanning freeThis glossary is general guidance, not veterinary advice. Always consult your veterinarian for medical decisions about your pet.
