✔ 最佳答案
Many dogs do this.
Males will lick where a female dog has urinated.
If he on a lead just pull him away and command him to "leave".
Not much you can do about it if he is running loose though, apart from shooing him away from where the other dog has peed.
Dog parks will the worse places for this behaviour as so many dogs use the park.
Exercise your dog where not many other dogs go.