Has he had a thorough neurological check?
If he has he may just need something for anxiety. (Some dogs are on prozac and do well)
Five months is usually earlier than most group training - most prefer at least 6 months, but some are smart and can do it at 5 months.
Hope you find the solution soon.
__________________ .   Cali  , and Cali's keeper and staff, Jay No, not a "mini" Yorkie - She loves to motor in her Mini Cooper car  |