The Breeder Blog

How to Choose the Right Size Whelping Box for Your Dog

by Phenyx Media on Jul 06, 2024

How to Choose the Right Size Whelping Box for Your Dog

When your dog is expecting puppies, providing a safe and comfortable whelping box is crucial for the well-being of both the mother and her newborns.

Choosing the right size whelping box is essential to ensure that your dog has enough space to move around, nurse her puppies, and feel secure.

Understand Your Dog's Size and Breed

The first step in choosing the right size whelping box is to consider your dog's size and breed. Larger dogs will obviously require a bigger whelping box compared to smaller breeds.

A general rule of thumb is to choose a box that is at least 1.5 times the length of your dog when she is lying down.

This will provide ample room for your dog to comfortably nurse and care for her puppies.

Consider the Number of Puppies

Another crucial factor to keep in mind is the expected number of puppies in the litter.

Some breeds tend to have larger litters than others, so it's essential to research your dog's breed and consult with your veterinarian to get an estimate of the litter size.

A larger litter will require a more spacious whelping box to accommodate all the puppies comfortably.

Allow Room for Growth

Puppies grow quickly, and they'll need space to move around and explore as they develop.

When choosing a whelping box size, consider the growth of the puppies over the first few weeks of their lives. A box that seems spacious enough at birth may become cramped as the puppies grow.

Opt for a size that will accommodate the puppies comfortably until they are ready to venture out of the box.

Provide a Safe and Secure Environment with the Heated Whelping Kit

Newborn puppies are very vulnerable to being smothered or dying from hypothermia. That's where the Heated Whelping Kit comes in - this patented system is designed to prevent these risks and keep your puppies safe.

The kit includes a perimeter shelf, or pig rail, placed just above the floor to protect the newborns from being pushed against the outer wall and trapped or suffocated.

The floor under the rail is heated using the included heating tape with a thermostat, ensuring that the puppies stay warm in this safe area before moving to the mother-to-nurse.

Choose the Right Material

When selecting a whelping box, consider the material it's made from. A wooden box is a popular choice for its durability and ability to provide insulation.

However, plastic boxes are also a good option as they are lightweight, easy to clean, and can be disinfected between litters. Regardless of the material, ensure that the box is sturdy and free from any sharp edges or hazards that could harm your dog or her puppies.


Choosing the right size whelping box is essential for providing a safe and comfortable environment for your dog and her puppies.

By considering your dog's size and breed, the expected number of puppies, room for growth, safety, and the appropriate material, you can select a whelping box that will meet the needs of your growing family.

FAQ’s on Choosing the Right Size of Whelping Box

How do I determine the right size whelping box for my dog?

Choose a box that is at least 1.5 times the length of your dog when she is lying down. This will ensure enough room for your dog to comfortably nurse and care for her puppies.

What should I consider when choosing a whelping box size if I'm expecting a large litter?

For large litters, select a more spacious whelping box to accommodate all the puppies comfortably. Consult with your vet to estimate the litter size and choose a box that allows room for growth.

How does the Heated Whelping Kit help keep newborn puppies safe?

The Heated Whelping Kit features a perimeter shelf to protect newborns from being trapped or suffocated, and a heated floor under the shelf to keep the puppies warm and safe.

Will the Heated Whelping Kit make my dog uncomfortable?

No, the Heated Whelping Kit only heats the floor perimeter, so the mother is not subjected to additional heat and stress, allowing her to comfortably care for her puppies.

What's included in the Heated Whelping Kit, and what do I need to purchase separately?

The kit includes heating tape with a thermostat and a power cord. It does not include PVC or crate. The 4 PVC Whelping Rail Adapters are sold separately.