
I use a harness on my pup and have done since he was 8 weeks old. I didnt really "get him used to it" I just put it on him and chucked him in the car ;) He is fine with it, just falls asleep on the back seat. I suppose all pups are different though I can imagine some might really hate it. Why not pop it on him when feeding him or playing so he associates it with something good ?
Claire :)