We switched our boy from a plastic 36" ot a wire 42" at 16 weeks old and he now sleeps like a rock.
We actually did because he had a penchant for running his paws up and down the sides of the plastic keeping us up and also because he was squishing his ears against the sides of the plastic crate (ears up!).
Best thing we ever did. He stretches fully out and is a perfect fit and no potty issues. We place a blanket over part of it for him and then leave bottem edges all open for air to move in and out since cool air sticks near floor.
We actually did because he had a penchant for running his paws up and down the sides of the plastic keeping us up and also because he was squishing his ears against the sides of the plastic crate (ears up!).
Best thing we ever did. He stretches fully out and is a perfect fit and no potty issues. We place a blanket over part of it for him and then leave bottem edges all open for air to move in and out since cool air sticks near floor.