This might sound wierd but do you leave a radio or anything on for him while he is in his crate?
My two have to stay in crates while we are out because they too would have a mess..... in their case I am not sure it would be SA so much as "WOW this is fun.... we can make a mess and mom can't stop us."
anyway I give them a kong and a toy for the crate when it's time to go in as well as some biscuits. I give the crate command although Belle is usually already in their patiently awaiting the hot dogs in the kong lol. They go in their crates and they get their goodies. I turn on some music for them that they can hear all day long.
They used to bark when we would first leave but not anymore.... and if we come home earlier than expected we usually find two sleeping puppies just waking up from a nap.
they don't EVER get hot dogs unless it's in their crate.... so it's a special treat for them and I really think the music helps to calm them and not feelso alone.
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