What is wet food?
Updated By PetymFacts checked against official sources on
Quick answer
Wet food is canned, pouch or tray pet food, sealed and then heat-sterilised, and roughly 68 to 78% water. It is tasty, filling and adds water to a pet's day, which can help cats with urinary problems, but it costs more per calorie than kibble and spoils quickly once opened, especially in Indian heat.
Also called canned pet food, pouch food, gravy food, wet cat food, wet dog food.
Key facts
- Canned dog and cat foods are 68 to 78% water, and the sealed cans are retorted, a heat and pressure cook that also sterilises the contents. Merck Veterinary Manual
- Canned cat food is at least 75% water, against 6 to 10% for dry food. Cornell Feline Health Center
- Feeding canned food makes a cat's urine less concentrated, which can help cats with urinary disease, and it is more filling for some cats. WSAVA
- Once a can is opened, keep the leftovers in the fridge and use them within 48 to 72 hours. WSAVA
- Wet food is more expensive per calorie than kibble, and uneaten food in the bowl should be thrown away after about 30 minutes. VCA Animal Hospitals (Canadian Academy of Veterinary Nutrition)
What counts as wet food?
Any pet food sold sealed with most of its weight as water: cans, pouches, trays and chunks in gravy or jelly.
The sealing and cooking process is what makes an unopened can safe on a shop shelf for a long time: heat and pressure cook the food inside the closed can and kill food-borne germs. Once the seal is broken, wet food behaves like any cooked meat dish and needs the fridge.
Because so much of it is water, wet food has fewer calories per spoonful than kibble. That is useful for a hungry pet on a diet, since a bigger bowl looks and feels like more, but it also means a pet must eat a much larger weight of wet food to get the same nutrition. Not every pouch is a full meal: some are labelled complementary, or for intermittent or supplemental feeding, and are meant as toppers or treats. Check the label for a complete and balanced statement before feeding it as the main diet.
When is wet food a good choice?
Cats
Cats that drink little
Cats are not good drinkers. Wet food gives them more water and less concentrated urine, which can help cats with urinary disease. Multiple water bowls or a fountain also help. WSAVA
Weight
Pets losing weight on a plan
Its lower energy density means a larger portion for the same calories, and some cats find it more filling. VCA Animal Hospitals (Canadian Academy of Veterinary Nutrition)
Appetite
Fussy, older or unwell eaters
Canned food is highly palatable to most cats, and warming it slightly can increase its aroma for a dog with a poor appetite. A pet that stops eating needs a vet, not just a tastier food. Cornell Feline Health Center
Both
Mixed feeding
Many owners give some wet food alongside kibble. Both can be complete and balanced; count the calories of each so the total does not creep up.
How do you keep wet food safe in Indian heat?
In a hot kitchen or during a power cut, opened wet food spoils quickly. Treat it like cooked meat.
Do
- Cover an opened can or pouch, refrigerate it, and use it within 48 to 72 hours, or sooner if the label says so. WSAVA
- Take the bowl up and throw away anything not eaten within about 30 minutes. VCA Animal Hospitals (Canadian Academy of Veterinary Nutrition)
- Warm fridge-cold food to room temperature, or slightly more, for a fussy eater, then stir and check it is not hot. VCA Animal Hospitals (Canadian Academy of Veterinary Nutrition)
- Wash the bowl after every wet meal, as you would a plate of cooked meat.
Don’t
- Do not leave wet food out for grazing all day, as you might with kibble. VCA Animal Hospitals (Canadian Academy of Veterinary Nutrition)
- Do not feed a complementary or supplemental pouch as the whole diet. Association of American Feed Control Officials
- Do not add vitamin or mineral supplements on top of a complete food unless your vet advises it. WSAVA
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Questions owners ask
Is wet food better than dry food for cats?
- Not for every cat. Wet food adds water, makes urine less concentrated and can help cats with urinary disease or those that need to lose weight, but many cats eat mainly dry food and live long, healthy lives. Choose a complete and balanced food and ask your vet what suits your cat.
How long can wet cat food sit out?
- Lift the bowl and throw away uneaten wet food after about 30 minutes. In Indian heat, bacteria grow fast on moist food. Covered leftovers from an opened can belong in the fridge and should be used within 48 to 72 hours, or sooner if the label says so.
Can I mix wet food with kibble?
- Yes. Many owners feed both. Work out the calories from each so the total matches what your pet needs, because adding wet food on top of a full bowl of kibble is an easy way to overfeed. In dogs both can share a bowl; some cats prefer them served separately.
Is a gravy pouch a complete meal?
- Only if its label says it is complete, or complete and balanced, for that species and life stage. Some pouches are complementary, or for intermittent or supplemental feeding, and lack essential nutrients if fed alone. These belong in the treat share of the diet, not as the main meal.
Keep reading
Related terms
More in nutrition
- BARF dietA BARF diet, short for bones and raw food or biologically appropriate raw food, feeds a dog or cat uncooked meat, organs and bones, sometimes with vegetables. Vets warn that the claimed benefits are not backed by science, while the risks are well documented: germs such as Salmonella and Listeria, bone injuries and unbalanced nutrition.
- Complete and balancedComplete and balanced is a pet food label claim that the food contains every nutrient a dog or cat needs, in the right amounts and ratios, so it can be fed as the whole diet for a stated life stage. Foods without it, labelled complementary or for intermittent feeding, are treats or toppers, not meals.
- Grain-free dietA grain-free diet is pet food made without cereals such as rice, wheat or maize, usually using peas, lentils, other pulses or potatoes instead. Grains are not fillers and most pets digest them well. Since 2018 the US FDA has looked into reports of heart disease, called DCM, in dogs on such foods, without proving a cause.
- Home-cooked dog foodHome-cooked dog food is a dog's main diet made in the family kitchen, such as rice, dal, eggs, chicken and vegetables, instead of a commercial food. It can be healthy if it is complete and balanced, but most generic recipes are not: a UC Davis study found 95% of 200 recipes short of at least one essential nutrient.
- KibbleKibble is dry pet food: dough cooked and shaped under pressure, then dried to about 10% water. It is the cheapest and easiest way to feed a dog or cat a complete diet, keeps at room temperature, and can be measured exactly. Choose one labelled complete and balanced for your pet's life stage.
- Resting energy requirement (RER)The resting energy requirement, or RER, is the number of calories a healthy pet needs in a day lying at rest in comfortable surroundings. Vets calculate it from body weight as 70 times the weight in kilograms to the power 0.75, then multiply it by a factor for life stage and neutering to estimate daily food.
- TheobromineTheobromine is a bitter natural chemical in cocoa, from the same family as caffeine. Dogs clear it slowly, so a chocolate snack can build up to a poisonous level, causing vomiting, restlessness, a racing heart, tremors and seizures. Cocoa powder and dark chocolate carry the most. If a dog eats chocolate, call a vet straight away.
- Treat allowanceA treat allowance is the share of a pet's daily calories that can come from treats, chews, toppers and table food without unbalancing its diet or causing weight gain. Vets' nutrition guidance puts it at no more than about 10% of the day's calories, with the other 90% from a complete and balanced food.
- XylitolXylitol is a sugar alcohol used to sweeten sugar-free gum, mints, sweets, some nut butters, toothpaste and medicines. In dogs it triggers a large release of insulin, so blood sugar can fall sharply within 10 to 60 minutes, and some dogs go on to liver damage. Any amount eaten is a reason to call a vet straight away.
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Sources
Each source was opened and read on the date shown. How Petym checks its sources
- Merck Veterinary Manual: Dog and cat foods (full review November 2023, updated June 2025) (opens in a new tab)
- Cornell Feline Health Center: Feeding your cat (updated 30 April 2026) (opens in a new tab)
- WSAVA: Frequently asked questions and myths (Global Nutrition Committee) (opens in a new tab)
- VCA Animal Hospitals (Canadian Academy of Veterinary Nutrition): Dry, canned, or semi-moist: food choices for dogs (updated 20 March 2024) (opens in a new tab)
- Association of American Feed Control Officials: Reading labels (opens in a new tab)