Kelpies are working dogs, not pets. They are really quite smart and need to be stimulated - they are bred for working so you may need to start providing him with a more stimulating environment because it sounds like he is bored and if you can't provide it then you may need to rehome him - preferably with someone who has a few sheep Our kelpie used to be the same when she was younger (she is nearly 12 now so nearing retirement age LOL) and if she went more than a few days without being near sheep - either out in the paddock or in the yards then she would go a bit stir crazy.