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Few cat topics start more arguments than wet versus dry food. The honest answer is that both can be healthy. They differ in water, cost, convenience and how easily they lead to overeating.
Key figures
- 6 to 10 percent Water content in dry cat food
- at least 75 percent Minimum water content in canned cat food
The biggest difference is water
Cornell’s Feline Health Center says dry food contains between 6 and 10 percent water, while canned food contains at least 75 percent. Cats evolved to get much of their water from prey, and many do not drink much on their own.
Cornell notes that cats need roughly 4 ounces of water per 5 pounds of lean body weight each day, about a cup for a 10-pound cat, from food and drinking combined.
- Canned (wet) foodat least 75%
- Dry food6 to 10%
From Cornell Feline Health Center. Exact values vary by product; check the guaranteed analysis on the label.
Pros and cons
| Wet (canned) | Dry | |
|---|---|---|
| Water | High | Low |
| Cost | Generally the most expensive | Cheaper per calorie |
| Convenience | Must be refrigerated once opened | Can be left out |
| Weight control | Easier to portion as meals | Easy to overfeed free-choice |
| Storage | Long shelf life unopened | Vitamins degrade and fats can go rancid if stored long |
A practical middle ground
- Feed measured meals rather than a bowl that is always full.
- Add some wet food each day for extra water.
- Buy dry food in sizes you finish within weeks, and keep it sealed.
- Change foods gradually over about a week to avoid upset stomachs.
Wet or dry, look for a “complete and balanced” statement for your cat’s life stage. That is what tells you the food can be fed on its own.
The food label guide covers nutritional adequacy separately from format. The water access guide covers observing drinking and offering water resources.
Questions people ask
Is wet food better than dry food for cats?
Neither is better for every cat. Wet food adds water and helps with portion control; dry food is cheaper and convenient. Many owners feed both.
How much water should a cat drink?
Cornell says about 4 ounces per 5 pounds of lean body weight per day, from food and drinking combined.
Can I leave dry food out all day?
You can, but free-choice feeding makes overeating easy. Measured meals help keep cats at a healthy weight.
How long can wet cat food sit out?
Refrigerate opened cans and do not leave wet food out for long, especially in warm rooms.
Where these figures come from
- Feeding Your Cat Cornell Feline Health Center · vet.cornell.edu
- Hydration Cornell Feline Health Center · vet.cornell.edu
Figures last checked September 2026.
