I guess my question is what do they do when you come back
I have been dealing with this sort of thing for 10 years with one dog if the dog is large or small they have the little colors never electric of course I can't get them to work your best bet is For assistance with water lemon juice inside just enough to let him know there's lemon in there and it can't be a part-time thing is got to be everytime the first bark and eventually they don't care for it especially the ones that don't like a bath try that avoid the electric shock collars I had a friend use it and her dog's neck got infected so it's a horrible problem and I've been there but try that the water but you've really got to be persistent
You could always try a thunder shirt. Your dog may have seperation anxiety.
A third option is ultrasonic bark deterrent, like a small speaker. Works for neighboring dogs too.
A bark collar usually
From what I've heard they need training to know that yes you will return.
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