Practice confinement during the day for a few minutes, gradually increasing the time spent in the crate. The crate should be kept in the bedroom. Crates are highly recommended for housebreaking and chewing. When a dog is left alone during the night, the dog should be in it's crate. Many dogs are surrendered to shelters because of separation anxiety.
Separation anxiety is a behavior in which a dog is stressed when left alone.
An animal behaviorist or a respectable, professional trainer should diagnose this behavior. Below are some tips to help deal with a diagnosed dog. Don't fuss over you dog prior to leaving or arriving home. Use a crate, introduce slowly and use properly. Do not provide attention all the time to your dog.