Wet vs Dry Food for Rescue Dogs and Cats, and How to Switch Slowly

"Should I feed wet or dry?" is one of the first questions new adopters ask, often in a pet store aisle full of options. The calm answer: start with the food your pet already knows, and talk to your vet before making changes. Both wet and dry foods can be complete and balanced, and neither is right for every pet.

This article matches pages 10 and 11 of the free First Night Home 14-Day Planner (Food: wet vs dry, and the switching log) and Video Guide 10.

Start with what they know

A new home is already a big change. A sudden change in food can add stomach upset on top of stress. Ask the shelter or foster exactly what your pet was eating, how much and how often, and try to keep that the same for the first days or longer.

Wet and dry, plainly

Wet food (canned or pouches)

• Much higher moisture content
• Must be refrigerated once opened
• Leftovers should be picked up sooner, as wet food spoils faster in the bowl
• Handy for lick mats and enrichment (Guide 5)

Dry food (kibble)

• Much lower moisture content
• Store sealed, cool and dry
• Keeps longer in the bowl
• Handy for food puzzles and scatter feeding

Cornell Feline Health Center notes that cats' nutritional needs differ from dogs', and its guidance on feeding cats discusses both wet and dry options. The ASPCA's nutrition tips for dogs and cats emphasize feeding a complete and balanced diet appropriate to the animal's life stage, and checking with your vet.

Some homes feed a mix of wet and dry. That's fine too, as long as total portions are right for your pet. Your vet is the best guide for what type, how much and how often.

What "complete and balanced" means

Look for a statement on the label that the food is complete and balanced for your pet's life stage (for example, growth or adult maintenance). The AAHA 2021 Nutrition and Weight Management Guidelines encourage pet owners and veterinary teams to talk about nutrition at every visit. Bring the bag or a photo of the label to your first vet visit (Guide 12).

Good feeding habits from day one

• Fresh water available at all times
• Measure meals with a measuring cup so portions are consistent
• Count treats as part of the day's food
• Feed at the same times each day
• Ask your vet before giving people food. Some foods, like chocolate, grapes and raisins, onions, garlic and xylitol, are on the ASPCA's list of foods to avoid
• For dogs and cats sharing a home, feed separately so no one steals or guards food

Switching foods slowly

If you and your vet decide to change foods, the AAHA's tips on transitioning pets to a new food describe mixing new food into the old gradually. Page 10 of the planner uses four simple steps:

1. Mostly old: about a quarter new food
2. Half and half
3. Mostly new: about three quarters new food
4. All new food

Ask your vet how long to stay at each step. Some pets transition in about a week; others need longer. Cats can be slower to accept a new taste or texture. Patience, not pressure.

If your pet stops eating, vomits or has diarrhea during a switch, go back a step and call your vet.

Switching between wet and dry

Changing texture (for example, a cat used to dry food trying wet) works the same way: small amounts, gradually. Some cats are very particular about texture and temperature. Offering wet food at room temperature rather than straight from the fridge may help, but check with your vet for your pet's needs.

Use the switching log

Page 11 of the planner is a switching log: current food, new food, the vet's advice on timing, then a row per day for the mix you served, how much was eaten, water, potty or litter, and notes. It takes a minute a day and gives your vet clear information.

Not eating? Call your vet

Many new pets eat less for the first day or two. But appetite changes can have medical causes. This matters for cats as well as dogs: don't wait to see if they get hungry enough. If your pet isn't eating, call your vet.

Common feeding questions in the first weeks

Should I free-feed? Measured meals at set times make it easier to notice appetite changes, which is useful information in the first weeks. Ask your vet what suits your pet.

How many treats are okay? Count treats as part of the day's food. Small, soft treats work well for training. Ask your vet how much your pet should have overall.

What about water? Fresh water at all times. For cats, a wide, shallow bowl placed away from food and litter is a common choice. Note in the tracker if your pet seems to drink much more or much less than usual, and mention it to your vet.

What if the shelter food is hard to find? Ask the shelter for the exact brand and formula, and ask your vet for a similar option if you need one. Then switch slowly.

The short version

Start with the familiar food. Feed measured meals at regular times. Talk to your vet before switching, and switch slowly if you do. Write it down.

Common questions

Sources

Checked October 24, 2026. This guide summarizes public guidance from these organizations; it is not veterinary advice.

1. AAHA, Tips and Timelines for Transitioning Your Pet to a New Food (PDF)
2. AAHA, 2021 Nutrition and Weight Management Guidelines
3. Cornell Feline Health Center, Feeding Your Cat
4. ASPCA, Dog Nutrition Tips
5. ASPCA, Cat Nutrition Tips
6. ASPCA, People Foods to Avoid Feeding Your Pets