What do I do about a 9-mth old boxer with separation anxiety?

If you have your puppy crate trained leave something with your scent in the kennel and praise him when you leave and when you return and make sure that you play with him before you leave to tire him out so he will wanna sleep. Also if you plan on being gone for more than 4 hours have someone go to your house and let it out and maybe take it for a walk or play with it. Good luck I have a golden retriever who I adopted and he had horrible seperation anxiety at first but after these option were executed he has gotten a lot better and is fine when I have to go to work now.