The minute you go out of sight he begins to whine, cry, bark etc. In severe cases the dog eliminates and becomes destructive. In most cases, time and patience resolve the problem. Try putting something that smells like you in the crate with him along with chew toys. If, however, he panics in close quarters, then crating can make matters worse.
Most bassets respond well to a four-legged pal as a companion and playmate.
Make his environment more stimulating or entertaining. To help engage his mind and body, frequently change the array of toys you leave out. Totally withdraw attention from him 15 minutes before leaving and 15 minutes after you come home. The more fuss you make about coming and going, the more anxiety you instill in the dog. Also, if you have any behavior problems, you can get expert advice on how to correct them.