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Rather than buying several crates of different sizes to use as your puppy grows up, buy a crate based on his expected full grown size, then section off part of the crate for your puppy. There are commercial dividers available for some crates to make sectioning off an area easier. You want to have enough room for the puppy to stand, stretch, turn around, and sleep, but not so much that he decides he can eliminate in one corner and sleep in another. A crate should be his den, not an area for soiling. If he is soiling in his crate or kennel, he is either a puppy mill puppy and didn't learn proper canine manners from his mother --- or the crate is too large for the dog.