Firstly I think your parents should take him for obedience training so that he cal learn the basics. With regards his aggression towards cats I would need to do a session to sort this problem out. He needs to get walked for at least an hour everyday and if your parents cannot do it then I suggest they get a dog walker in who can. He sounds like a dog that has too much energy with nowhere to put it. Please give me a shout on 0798837566.
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