Choosing a crate to use in training your dog can be a tricky decision. There are a lot of options to consider such as size, material, shape, portability, etc. Your dog’s crate should be a place of comfort and security for him, so choose carefully when picking one. This will become your dog’s own “home” within your home.
One of the most important aspects of the choice is the size of the crate. Crates need to be large enough to allow the dog to stand up and turn but not too large as to allow a lot of extra space, or they may feel it is OK to use the bathroom within the crate. Dogs are generally clean animals and will not “go” in their crate unless there is enough space to keep it away from themselves. A cozy size will also allow your dog to feel as if it is protected by the closeness of the walls.
Another option to consider is the material with which the crate is built. The most common tends to be crossed metal bars, but there are also crates made of thin nylon materials and crates made of solid plastic. Personally, I prefer the metal design as it is durable, and it also gives my dog plenty of space to see around him, light, and fresh air. I feel that plastic crates often prevent this, and are generally not appropriate for everyday use, especially if your dog is in there for a few hours while you are out. The crates made out of nylon material are generally thin enough to allow plenty of light, but in some cases can be easily torn depending on the size and temperament of your dog.
In the end, you are the one that knows your dog best, and knows which crate type will be the most comfortable and the most appropriate to accommodate their size and disposition.