For a fully grown Cocker you will need a 30 inch or 36 inch crate. I would buy the biggest you have room for rather than buying a small one now and having to change it in a few months time. Savic are a good brand but you will also find what you need on eBay for quite a lot less money. You could consider a crate divider and half the space your pup has until it has grown a bit.