The first months of life involve rapid growth, which means puppies and kittens need food formulated specifically for development. Getting the basics right does not require a complicated feeding routine or a long list of supplements. For most healthy young pets, the priority is a complete life-stage diet, appropriate portions, fresh water and steady growth.
Puppies and kittens are not small adult animals. Their calorie and nutrient needs are different, and feeding adult food too early can leave the diet poorly matched to growth.
Start with a complete food designed for growth
The PDSA recommends complete, commercially prepared puppy food suited to the dog’s size and life stage. Cats Protection similarly advises feeding kittens a complete kitten food that provides the nutrients needed for development.
Look for the word “complete” on the label. Complementary foods and treats are not designed to provide the whole diet by themselves.
1. Keep the first few days familiar
Moving into a new home is a major change. If possible, continue the food and feeding routine used by the breeder or rescue initially. A sudden food change at the same time as a new environment can make digestive upset more likely.
If you want to switch food, do it gradually over several days or longer unless your vet advises otherwise.
2. Puppies need meals spread through the day
Young puppies have relatively small stomachs and usually cope better with several smaller meals than one or two large portions.
The exact schedule depends on age and breed. Follow the feeding guide on the food and veterinary advice, then gradually reduce meal frequency as the puppy grows.
Large and giant breeds can have particular growth needs, so choosing a puppy food designed for the expected adult size can be important.
3. Kittens naturally prefer little and often
Cats are naturally adapted to eating multiple small meals. Cats Protection notes that young kittens should be fed small amounts more frequently and that complete kitten food should be used once they are weaned.
Keep food and water easy to reach and consider placing water separately from food, as many cats prefer this.
4. Monitor growth, not just appetite
Puppies and kittens can be enthusiastic eaters, but appetite alone does not tell you whether the portion is right. Check body condition and weigh them regularly.
Your vet can help you track growth and advise whether the current feeding amount is appropriate. This is particularly useful for large-breed puppies, very small breeds or young animals that have been unwell.
5. Treats should not unbalance the diet
Training treats can be useful for puppies, and kittens may also enjoy small rewards, but treats should remain a small part of total daily intake.
Using some of the measured daily food allowance as training rewards helps avoid accidental overfeeding.
6. Avoid unnecessary supplements
A healthy puppy or kitten eating a complete growth diet usually does not need extra vitamin or mineral supplements. Adding nutrients “just in case” can upset the balance of the diet.
This is especially important during bone development. Only add supplements when there is a clear reason and preferably after veterinary advice.
7. Fresh water should always be available
Young pets need constant access to clean drinking water. Replace it regularly and wash bowls often.
If a puppy or kitten suddenly drinks much more or much less than usual, appears dehydrated, vomits repeatedly or develops diarrhoea, contact your vet.
8. Introduce food changes gradually
Whether switching flavour, brand or food type, gradual changes are usually easier on the digestive system. Mix increasing amounts of the new food with decreasing amounts of the old food over time.
Our Digestive Health collection contains complementary products for everyday digestive support, but persistent diarrhoea or vomiting in a young animal needs veterinary advice promptly.
9. Be careful with human foods
Young pets are curious and often quick to investigate dropped food. Some human foods are toxic to dogs or cats, while rich leftovers can cause digestive upset and unbalance the diet.
Keep chocolate, grapes, raisins, onions and other known hazards securely out of reach, and avoid making table scraps a routine part of feeding.
10. Know when to move to adult food
The right age varies. Cats are often transitioned from kitten to adult food around one year, while dogs mature at different rates depending on size and breed. Large breeds may remain on growth diets longer than smaller dogs.
Ask your vet or follow the manufacturer’s life-stage guidance rather than switching simply because your pet looks fully grown.
Supporting the whole pet
Nutrition works alongside sleep, play, training, socialisation and preventive healthcare. For wider everyday support, browse our Dog Wellness and Cat Wellness collections.
Frequently asked questions
Can a puppy eat adult dog food?
Adult food is not formulated for growth, so a complete puppy food is generally the better choice until the appropriate transition age.
Can a kitten eat adult cat food?
Kittens have higher energy and growth-related nutrient needs, so complete kitten food is recommended during the growth stage.
Should I free-feed a puppy or kitten?
Scheduled, measured feeding makes it easier to monitor intake and growth. Cats may prefer multiple small meals, but total daily intake should still be controlled.
Do young pets need multivitamins?
Usually not when they are eating a complete, balanced growth diet. Ask your vet before adding supplements.
What if my puppy or kitten stops eating?
Young animals can become unwell quickly. If appetite drops significantly, especially with vomiting, diarrhoea, lethargy or other symptoms, contact a vet promptly.
This guide provides general feeding information. Individual needs vary with breed, size, health and growth rate, so veterinary advice should take priority for specific concerns.