I don't know if anything can be done about this, but thought I'd ask anyway.
Our Tibetan Terrier pup is 3 and bit months old. He's a pretty good boy, so far: friendly, quite laid-back and we're getting there on most aspects of training (comes when I call 90% of the time etc). He is NOT a big barker - plays with other dogs without barking, doesn't bark when the doorbell rings, or when he goes into his crate etc.
We live in a typical London street of terraced houses. Next door, they have a border collie. It's a nice enough dog but has always been barky. The owner works from home and if he goes out, the dog barks for quite a while before he settles down (or the owner comes back, I don't know). Also, he always barks when he goes out into their garden and then, I presume, when he wants back in to the house.
Anyway, I've been letting our pup pretty much run in and out of the garden to help with the toilet training and he likes mooching around out there. But, as soon as next door's dog comes out to play, he starts barking and our pup barks back - loudly and in a growlier, snarlier way than at any other time.
I really don't want this to become a thing. It pisses me off, so it must piss off the neighbours. At the moment, I've just been bringing him straight back inside and not letting him back out until I know next door's is not out.
Any other thoughts on what I could do? Couple of other things which are probably important: there's a high fence between the gardens so the dogs can't see each other. Also, our neighbour is, let's say, not the easiest of people to get along with. Long story, but let's work on the basis that he'll do nothing to help...