First of all welcome! When you leave DON'T make a big scene just say bye when you put him in his crate to leave. Give him something to chew on, a tiny dog kong filled with peanut butter or something. Put the music on low when you leave. Some dogs are more prone to SA than others. Do not baby him to death either, that can trigger SA when you leave also. Plus you just got him, it takes dogs time to adjust.