Hello! Looking for a bit of advice! We have a two year old Australian Terrier (he is quite a social butterfly and quite the happy go lucky guy!) While walking on leash he is fabulous UNTIL he sees another dog approaching. He lays down in a very stalker-like fashion. He will not heel or get up from this position until the other dog has either passed (to which he responds with a very energetic mission to carry on the walk pulling me and sometimes extends a couple of yip yips) or if the dog approaches him he will happily smell and say hello and then get quite agitated (to which I pick him up and remove him from the situation.) How should I be addressing this? In the few times it is not an issue I do praise him but it seems forgotten on the next walk. He is walked 3 x a day. Thanks in advance!!!