There is a lot of speculation out there as to what size crate you should get for your new puppy. Some sources say that you should get a small crate to start with (one that is just big enough for your puppy to stand, lie down and turn around in) and get a new one periodically as the puppy grows. For many people however, this is not a cost-effective option. Another option is to buy a crate that has adjustable dividers (https://www.mypetwarehouse.com.au/petmate-two-door-training-crate-76cm-black-p-14863) so you can adjust the size of the crate’s interior as the puppy grows but again these are more expensive.
A more cost-effective option is to buy a crate that will be large enough to contain your dog comfortably even when he/she reaches their full adult size but not too big that it takes up unnecessary room in your house. A crate that is a comfortable size for your dog is one that is large enough for your dog is stand, lie down and turn around in.
Choose A Size
To determine the correct crate size, you will need for your dog, look at the box/packaging that the crate comes in. Most, if not all, products will come with a size guide indicating the crate size that is suitable for various dog breeds. As a general rule, there are: extra small, small, medium, large and extra-large crates available.
Once again, choose the crate that will be the perfect size for your dog when it is an adult.
Once You Have Purchased A Crate
Clearly, you cannot simply let your puppy have access to the entire crate because your puppy is still very small and hence toilet training will be difficult (because your puppy will just go to the toilet up one end of the crate and lie down the other end). What you need to do is place a box down one end of the crate to restrict the area your puppy can access- the smaller the puppy, the larger the box. You want to restrict the area down to a size so that the puppy can only stand, lie down and turn around. This makes toilet training easier because the puppy learns to hold on.
As the puppy grows, slowly decrease the size of the box- i.e. increase the area that the puppy has access to. When your puppy reaches full size then you can remove the box altogether.
This is a more cost-effective option because otherwise you are buying another crate every month or two. It also enables you to accommodate the puppy’s growth more frequently (adjust the area he/she has got access to) which keeps the crate area a comfortable size for your puppy.