
10 months or thereabouts is a typical age for the dog to hit adolescence. And we all know what teenagers are like - surging hormones, angst, tantrums, staying out all hours etc! Dogs seem to be exactly the same!
I've always been reassured by the fact that, if they were well behaved before they hit this stage, they will be well behaved when they come out the other side. It's just the in-between bit that's hellish!
When he does
eventually come back to you, have you ever scolded/punished him? Although you probably feel like thumping him, all it will do is teach him that, when he comes back to you, he's going to get punished! So grit your teeth, smile sweetly, and praise him!
It's easy to say, and difficult to do, but please don't call and call him. The more often he gets away with ignoring you, the more he'll feel confident and do it again. If you don't feel he's going to come when you call,
don't call him (unless he's in danger of being run over, etc). At the moment you're not the best thing in his life (all teenagers like to be out with their mates rather than be at home with the "old folks".) and the next thing to do is to make yourself more interesting to him than anything else.
I'm sure others will have ideas on how to do this.