When to Start Weaning Puppies and Kittens

ImmunityQ&AMeongsiljang Veterinary Advisory Board

We begin introducing puppy and kitten weaning food at 3 to 4 weeks of age. We’ll share evidence-based veterinary guidance on how to feed them at each stage, along with important precautions.

What is Weaning Food? When Should You Start?

Puppies and kittens who are just starting to eat solid food

Weaning food is a soft, transitional diet that helps puppies and kittens move from mother’s milk to solid food. Timing is key. Puppies should start weaning at around five weeks of age, while kittens can begin at three to four weeks. Because the appropriate weaning age differs between species, it’s important to follow species-specific guidelines. Starting too early can cause digestive issues due to an underdeveloped gastrointestinal tract, while delaying too long may lead to insufficient energy and nutrients for proper growth, as the young animal remains overly dependent on mother’s milk.

Why Start at This Stage?

Kittens begin to outgrow their mother’s milk as a sole source of energy and nutrients around 3 to 4 weeks of age, while puppies reach this stage at approximately 5 weeks. At this point, the mother gradually reduces her milk production, and the puppies and kittens require more calories and protein. According to veterinary nutrition textbooks, weaning puppies and kittens have significantly higher energy requirements per unit of body weight than adult dogs and cats. Therefore, they must receive a balanced diet rich in high-quality protein to support proper bone and muscle development.

Comparison of Weaning Timings for Puppies and Kittens

Item	Dog	Cat
Weeks 3–4	Mostly mother's milk (weaning food not started)	Start weaning food (porridge form)
Weeks 5–6	Start weaning food (porridge form), 3–4 times a day	Porridge+kibble mix, 3–4 times a day
Weeks 6–7	Transition mainly to water-softened kibble	Softened kibble+wet food mix
Weeks 7–10 or more	Fully weaned, dry kibble possible	Fully weaned, mostly wet food

Adjustment of 1–2 weeks is possible depending on the condition of the mother and offspring

How to Prepare Weaning Food and Key Checkpoints

Soak the puppy- or kitten-specific food in warm water or pet milk replacer until it reaches a porridge-like consistency. This is a key point to remember.

Temperature: Lukewarm, around 35–38°C (similar to body temperature)

Consistency: Start with a thin porridge and gradually thicken it over time

Frequency: Offer small amounts 4–5 times a day

Bowl: Use a shallow, wide dish to make it easy for them to lap up

Timing: Wait one hour between feedings after nursing

Signs to Stop Feeding Immediately and Visit a Veterinary Clinic During Weaning

If you notice any of the symptoms below while introducing solid food, stop feeding immediately and visit a veterinary clinic. Neonatal and weaning puppies and kittens are highly vulnerable to dehydration and hypoglycemia, so symptoms can worsen rapidly. If you observe any of the following signs, seek veterinary care without delay. - Diarrhea or vomiting lasting more than a day - Complete refusal to eat and lethargy - Cold body temperature and reluctance to nurse - Coughing or regurgitation of food through the nose

Differences Between Puppy and Kitten Weaning Food

Cats have a stronger carnivorous nature than dogs, so it’s important to use high-protein food from the start of their weaning period. According to veterinary nutrition guidelines, growing kittens require high-quality protein and essential amino acids like arginine to support healthy development. Kitten-specific formulas are carefully balanced to meet these needs, whereas dog food is not designed to support a kitten’s growth requirements. Conversely, feeding cat food to weaning puppies can lead to digestive issues or diarrhea due to an inappropriate nutritional balance for their species. Always use species-specific products to ensure your pet’s health and well-being.

Differences between dog food and cat food

Completion of Weaning and Transition Methods

Weaning is typically complete by around 7–8 weeks of age in kittens and between 7–10 weeks in puppies. By this stage, they can obtain adequate nutrition without their mother’s milk, and around 8 weeks of age is generally considered the appropriate time for adoption into new homes. However, please keep in mind that staying with their mother and littermates a bit longer can benefit their social development. Do not switch to dry food abruptly; instead, transition gradually over the course of a week. For the first three days, feed a mix of 70% soaked food and 30% dry food; for the next three days, use a 50:50 ratio; and finally, switch to 100% dry food. This gradual approach helps prevent digestive upset.

Foods Absolutely Prohibited During Weaning

Regular milk contains high levels of lactose and can cause diarrhea, so never give it to your pet. Human foods (including soy sauce, salt, and sugar), raw meat, honey, and raw eggs are also prohibited. This is especially important for young puppies and kittens, as they are at risk of bacterial contamination from raw meat or raw eggs; therefore, all weaning food ingredients must be heat-treated. Please use only food specifically formulated for puppies and kittens or products approved by your veterinarian.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

When should orphaned puppies start transitioning to solid food?

Even without a mother, puppies should begin weaning at around five weeks of age, while kittens start at three to four weeks. Before that, they must be fed specialized formula at body temperature every two to three hours.

How should I give water during the weaning period?

From the time you start introducing solid foods, always provide fresh water in a shallow bowl. Even if your pet doesn’t drink much at first, they’ll gradually get used to it.

My puppy refuses to eat solid food. What should I do?

First, try adjusting the temperature (to match body temperature) and consistency (making it thinner). Dab a small amount on your finger and apply it around your pet’s mouth; they’ll often start licking it. If your pet refuses it for more than three days, consult your veterinarian.

Should I give my puppy additional supplements during the weaning period?

If you’re feeding a high-quality puppy or kitten-specific diet, additional supplements aren’t necessary. In fact, excessive calcium or vitamin intake can actually interfere with proper skeletal development.

Can I mix canned tuna into my kitten’s weaning food?

Human-grade canned tuna is off-limits due to its high salt and mercury content. Please use wet food or pouches specifically formulated for pets, especially those designed for kittens.