When we got Lark, Lark was crated, Chase was not if I left the house. Chase was crated until he was about 3 years old, Lark graduated to no crate much younger. The puppy was a bundle of energy and even though Chase was good with other dogs of all sizes, I wanted him to be able to get away from the puppy if he wanted to. I wanted the puppy not to be "corrected" by Chase when she was little unless I was there to supervise. Asher will still be pretty small and new to your home. I'd crate him for the first several weeks or months until he's gained some size and weight and you have a better idea of how "the boys" will interact day in and day out.