Puppy Temperature Guide: Birth to 12 Weeks
Keeping newborn puppies warm is an important part of caring for a litter. The right amount of warmth helps them feed, digest milk and rest comfortably while they grow.
Their needs change quickly during the first few weeks, so a setup that suits newborns will need adjusting as they become more active. Two things help you get that balance right: the temperature around the puppies and their own body temperature.
Here, we explain what to aim for, how to monitor your litter and when a puppy may need extra help.
Why Newborn Puppies Need Help Staying Warm
Newborn puppies lose heat more easily than adult dogs. They have little body fat, and more body surface for their weight, which means warmth escapes quickly. Their ability to conserve heat is also still developing.
Mum and littermates provide much of that early warmth. Puppies raised alone, away from mum or in a small litter may need more help from their environment.
When a puppy becomes chilled, suckling and digestion can slow down. Less milk means less energy to stay warm, and low blood sugar and dehydration can follow. This cycle can contribute to fading puppy syndrome.
Temperature control improves considerably around three to four weeks of age, although size, health and surroundings still affect how much warmth each puppy needs.
Whelping Box Temperature by Age
The figures below refer to the air temperature in the warmed part of the whelping box. Measure this at puppy height, close to where they rest.
| Puppy Age | Â Approximate Temperature in the Warmed Puppy Area |
| First Week | 29 to 32°C |
| Weeks 2 and 3 | Around 27°C |
| Week 4 | Gradually reduce towards 22°C |
| Weeks 5 to 12 | Comfortable indoor conditions (20 to 22°C), with extra warmth if needed |
Use these as starting points and reduce heat gradually. Feeding well, settling between feeds and gaining weight are useful signs that your puppies are comfortable and progressing.
A warm section of the box usually works better than heating the whole room to newborn temperatures. It gives the puppies warmth while keeping a cooler area available for them and mum.
Premature, very small, orphaned or unwell puppies may need an individual heating plan from an experienced breeder, animal carer or your vet.
Normal Puppy Body Temperature
A puppy's body temperature is different from the temperature of the whelping box. Newborn puppies naturally have a lower body temperature than adult dogs, and it rises as they develop.
|
Puppy age |
 Usual Body Temperature Guide |
| First Week | 35.0 to 37.2°C |
| Weeks 2 and 3 | 36.1 to 37.8°C |
| Week 4 | 37.2 to 38.3°C |
| Weeks 5 to 12 | Approximately 37.5 to 39.2°C, approaching adult         temperatures |
These figures help you interpret a rectal thermometer reading. They are not settings for a heat pad or lamp. Consider the reading alongside the puppy's feeding, movement and weight gain.
Monitoring the Puppy Area
A digital thermometer & hygrometer with probe measures air temperature, temperature at the probe and humidity. Place the sensor probe at puppy height and check both the warmer and cooler parts of the box. Recheck after adjusting heating, changing bedding or moving the litter.
Bedding can be warmer than the surrounding air, particularly over a heat pad. The probe can be placed on the surface to help check the temperature where puppies are actually lying.
For body temperature, use a small digital rectal thermometer that can read low temperatures. Your vet can show you the correct technique for tiny puppies. Touch can help you notice a change, but it cannot tell you their exact temperature.
  
Heating Options for Puppies
The best heating option depends on your whelping setup and whether you need warmth in one place or while travelling. Our Heating & Critical Care range includes several options.
- Heat lamps provide overhead warmth to a selected part of the whelping box, leaving the bedding area clear.
- Heat pads provide warmth beneath the resting area. Temperature-controlled models can offer a steady source of heat.
- Microwave heat discs provide warmth without a power cord. They are useful for transport or time away from the main puppy area, although their warmth gradually decreases.
Use equipment as directed, leave a cooler area available and check the litter regularly. A weak newborn may need help moving away from heat.
Bedding, Humidity and Everyday Care
Dry bedding helps puppies hold their warmth. Moisture draws heat away from the body, so drying puppies after birth and replacing damp bedding are simple but valuable parts of neonatal puppy care.
Keep fresh air moving through the room without a draught blowing across the litter. For newborns, around 55 to 65% relative humidity is a useful guide. Very dry air can contribute to moisture loss.
Daily weighing and watching each puppy feed will help you spot changes early. Our guide to signs of dehydration in puppies explains how feeding, hydration and weight changes are connected.
Signs Puppies May Be Too Cold or Too Hot
Puppies that are too cold may:
- Feel cool and show less interest in feeding.
- Cry persistently or huddle unusually tightly.
- Suckle weakly or become less active.
Puppies that are too hot may:
- Keep moving away from the heat source.
- Become restless or breathe more quickly.
- Show panting, drooling or weakness, particularly in older puppies.
Look at each puppy as well as the litter. These behaviours can also reflect hunger or illness, so check the temperature rather than assuming every unsettled puppy needs more heat.
Warming a Cold Puppy Before Feeding
A cold puppy needs gentle, gradual warming. Hypothermia means the body temperature has dropped too low, which can slow digestion and weaken the suckling response.
Do not feed a hypothermic puppy, as they cannot digest milk properly when their body temperature is too low. Feeding before the puppy is appropriately warmed also increases the risk of milk coming back up and entering the lungs. A cold, weak puppy needs prompt veterinary advice while gentle warming begins.
Our guide to warming a cold puppy safely explains the approach. Once warm and stable, puppies needing supplementary feeds can be supported with suitable neonate puppy nutrition and syringe, bottle or tube feeding equipment. Tube feeding requires practical training.
Keeping Puppies Comfortable from 5 to 12 Weeks
As puppies become more mobile and better at controlling their body temperature, most healthy litters can move towards normal indoor conditions. A dry, comfortable sleeping area remains important, with extra warmth adjusted to the puppies and the weather.
Small or fine-coated puppies may need more warmth in cool conditions. During warm weather, provide shade, ventilation and fresh drinking water. Flat-faced puppies need particular care in the heat because they can have more difficulty cooling themselves.
When to Contact Your Vet
Contact your vet promptly if a puppy has a temperature outside the expected range for its age, repeatedly becomes chilled, stops feeding or is not gaining weight.
A body temperature below 35°C, marked weakness, breathing difficulty, collapse or poor responsiveness needs urgent attention. Warming alone may not resolve the problem if low blood sugar, dehydration or illness is also involved.
Final Thoughts
Keeping puppies comfortable comes down to steady warmth, dry bedding and paying attention to each puppy. Check conditions where the litter rests, watch feeding and growth, and adjust the heating as their needs change.
For a broader look at feeding, monitoring and everyday litter care, read our guide to How to Care for Newborn Puppies.