If you have a treat and take a step back and say come will he come? It needs to be a game and as happy as possible. Don't try calling him outside to bring him in or he will never come again. Teach come in low distraction situations at first and then try teaching it outside or elsewhere. If he won't come at all try praising him when he just naturally walks over to you and say "come, good come" when he comes.
You can crate train at any time. We trained our puppy from day one and Keepers was crate trained at 3 years old.
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Andrea & Keepers (and Boo)
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