The Complete Guide to Artificial Rearing of Newborn Puppies and Kittens (Formula, Intervals, Positioning)

Brain & CognitionQ&AMeongsiljang Veterinary Advisory Board

We’ve compiled everything you need to know about safely raising newborn puppies and kittens born without their mothers, including the basic principles of artificial feeding, formula preparation, feeding intervals, proper positioning, stimulating elimination, and emergency warning signs.

What Is Artificial Rearing of Newborn Puppies and Kittens?

Newborn puppies and kittens lying side by side on a warming mat, with their special formula and bottles placed nearby.

Artificial rearing is an emergency care method in which caregivers provide nutrition to newborn puppies and kittens that cannot be cared for by their mothers, using species-specific formula and bottles. Maintaining body temperature and adhering to proper feeding intervals are critical for survival. Newborns have immature thermoregulation and are highly sensitive to ambient temperature; if feeding intervals are too long, the risk of hypoglycemia and hypothermia increases significantly. Because the appropriate feeding schedule and target temperature range vary depending on the animal’s age, weight, and health status, it is safest to determine these parameters under veterinary guidance. Never use human milk or formulas not specifically designed for dogs or cats, as they can cause nutritional imbalances leading to diarrhea and hypoglycemia. Always use species-specific formula.

When Is Artificial Rearing Necessary?

If any of the following situations arise, you should begin artificial rearing immediately: - Loss of the dam: The mother dies during birth or is unable to nurse due to health issues. - Rejection of offspring: The mother pushes the puppies away or displays aggressive behavior toward them. - Insufficient milk supply: The puppies cry continuously, fail to gain weight, or even lose weight. - Large litter size: There are more puppies than teats, preventing some from nursing in turn. - Weak neonates: Low-birth-weight puppies that are unable to nurse on their own. Under normal conditions, neonates should gain approximately 5–10% of their body weight each day. Therefore, a lack of weight gain or weight loss is a critical sign of inadequate nutrition. For safety, it is essential to have a veterinarian check for dehydration, hypoglycemia, and hypothermia before starting artificial rearing.

Essential Supplies for Artificial Rearing

Here’s what you should prepare in advance: - Specialized milk formula: Use only species-specific formulas for puppies or kittens (formulas differ by species and must never be mixed or substituted). - Newborn bottles and nipples: Silicone nipples with very small openings. - Warming supplies: Heating pad, blankets, and an indoor thermometer. Newborns have immature thermoregulation and are highly sensitive to ambient temperature, so it’s essential to maintain a consistently warm environment. - Scale: A kitchen scale accurate to 1 gram, used to weigh your pet at the same time each day. - Sterilization supplies: Bottle sterilizer set, soft gauze pads, and wet wipes. Keep a thermometer on hand as well, and discuss glucose supplementation protocols with your veterinarian in advance to be prepared for potential hypoglycemia emergencies. Because newborns have weak swallowing reflexes and are at risk of aspiration, always follow your veterinarian’s specific instructions regarding the form and method of administration in emergency situations.

Essential supplies for bottle-feeding: bottles, specialized formula, a scale, blankets, and a thermometer.

How to Mix Formula and Feeding Volume Guidelines

Mix the formula with warm water (38–40°C) according to the ratio indicated on the product label, so it’s close to body temperature when fed. Please avoid overfeeding at once and follow the guidelines below.

Feeding Intervals and Amounts per Age (Based on 100g Body Weight)

Item	Week 1	Week 2	Week 3	Week 4
Feeding Interval	2 hours	3 hours	4 hours	4-6 hours
Feedings Per Day	10-12 times	7-8 times	5-6 times	4-5 times
Amount Per Feeding (Puppy)	1-2ml	3-4ml	5-7ml	8-10ml + weaning food
Amount Per Feeding (Kitten)	2-3ml	4-6ml	7-9ml	10-12ml + weaning food
Nighttime Feeding	Essential	Essential	1-2 times	Not needed

There are differences depending on weight and health condition. Please adjust the feeding amount after consulting a veterinarian.

What You Must Never Do

The following practices can directly lead to neonatal mortality: - Do not use human milk, soy milk, or infant formula: Differences in lactose and protein composition can cause diarrhea and dehydration. - Do not feed while lying on the back: This can cause formula to flow into the lungs, posing a risk of aspiration pneumonia. - Avoid formula that is too cold or too hot: This can cause hypothermia or oral burns. - Do not force-feed: If the puppy is too weak to suckle, it may be hypoglycemic; consult a veterinarian immediately. - Do not reuse leftover formula: Discard any formula that has been left at room temperature for more than two hours.

Proper Feeding Position and Method

Hold the puppy with its belly down and head slightly tilted up, mimicking the natural nursing angle. Avoid pointing the head downward or overextending the neck, as both increase the risk of aspiration. Align the nipple so it enters the mouth straight, allowing the puppy to form a proper seal around it, which reduces air swallowing and lowers aspiration risk. If the puppy feeds too quickly, pause briefly to let it breathe. After feeding, hold the puppy upright and gently stroke its back to help burp it. If milk leaks from the nose or mouth, stop feeding immediately, tilt the head slightly forward to let the milk drain, and consult your veterinarian.

Hold the newborn puppy with its belly facing downward and tilt the bottle at a 45-degree angle for proper feeding posture.

Stimulating Elimination After Feeding

Newborn puppies and kittens cannot urinate or defecate on their own until they are 2 to 3 weeks old. You must take over the role of the mother, who normally stimulates them by licking. - Timing: Every time, before and after feeding - Method: Gently tap and massage the area around the anus and genitals with gauze or a soft wet wipe dampened with warm water - Duration: 20 to 30 seconds, until urine or feces are passed - Caution: Rubbing too hard can cause skin irritation. Always clean the area thoroughly and dry it afterward If your pet has not urinated for more than 24 hours or if their abdomen appears distended, seek veterinary care immediately.

Emergency Signs Requiring Immediate Veterinary Care

If you notice any of the following symptoms, take your pet to an emergency veterinary clinic immediately: - Body temperature below 35°C or above 39°C - Inability to nurse and lethargy - Rapid breathing or bluish discoloration - Persistent diarrhea, bloody stools, or vomiting - No weight gain or weight loss over 24 hours - Suspected seizures or convulsive movements Neonates can deteriorate very rapidly, with life-threatening changes occurring within just a few hours.

Weight Monitoring and Weaning Timing

Weighing your pet at the same time every day is the most reliable indicator of their health. For both puppies and kittens, a daily weight gain of 5–10% of their current body weight is considered normal. Because the absolute number of grams varies depending on their current weight, monitoring the percentage increase is more accurate. At 3–4 weeks of age, you can introduce a weaning diet by mixing softened puppy or kitten starter food with specialized milk replacer to create a porridge-like consistency and offering small amounts on a plate. During this period, it is also recommended to encourage even those living with their mother to start eating the same food as her. Transitioning to a complete solid diet typically occurs at 6–8 weeks of age.

A 3-week-old puppy and kitten licking their first solid food from a shallow dish

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

Can I feed puppy milk replacer to a cat?

No, that’s not advisable. The nutritional composition of canine and feline milk differs significantly, so it’s essential to use a species-specific formula. Using a product not formulated for your pet’s species can lead to nutritional imbalances. This applies equally in reverse—feeding kitten formula to puppies is also not recommended.

Do I really need to wake my pet every 2 to 3 hours at night to feed it?

Nighttime feedings are essential for puppies up to two weeks of age. During this period, their ability to store nutrients is still limited, so excessively long intervals between feedings can significantly increase the risk of hypoglycemia and hypothermia. Setting an alarm to maintain consistent feeding intervals is the safest approach. Please consult with your veterinarian to determine the specific feeding schedule best suited to your puppy’s individual condition.

Can I substitute goat milk or commercially available cow’s milk for puppy formula?

In emergencies, it can be used temporarily as a substitute under veterinary guidance, but it does not meet the nutritional composition of species-specific formulas. Commercially available milk (such as cow’s milk) has a different nutritional profile from dog or cat milk and is therefore unsuitable; please switch to a specialized puppy or kitten formula as soon as possible. Be sure to consult your veterinarian regarding the duration and method of substitution.

What should I do if my pet vomits right after nursing?

It’s likely that your pet ate too much at once or was fed too quickly. Try reducing the amount and feeding more slowly during the next meal. If vomiting persists or your pet seems lethargic, seek veterinary care immediately.

Can I perform tube feeding myself?

Tube feeding can be fatal if the tube is misplaced and milk enters the lungs. For weak puppies that cannot nurse from a bottle, it is essential to receive proper training from a veterinarian, and hospitalization is strongly recommended whenever possible.

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References

[1] Peterson, M.E., Kutzler, M.A., Small Animal Pediatrics: The First 12 Months of Life, Saunders, 2011

[2] Hoskins, J.D., Veterinary Pediatrics: Dogs and Cats from Birth to Six Months, 3rd Edition, Saunders, 2001

[3] Little, S.E., The Cat: Clinical Medicine and Management, Elsevier, 2012 (Chapter on Pediatrics and Neonatal Care)