We have a very large greyhound/deerhound cross although he was 12 weeks old when we brought him into the house. He is petrified of the cat - who has all his claws (de-clawing is not done here unless for medical reasons) and the cat uses them regularly! He bats the dog on the nose every morning to let him know who's boss.

We sprayed him with water, from behind, every time he even showed the slightest interest in the cat as the cat was here first and had tenancy rights! If this is an older dog then a crate or even keeping him on a leash when the cat is around is a good idea. If the dog is in the crate then the cat will feel safe enough to investigate. Never let the dog worry the cat, even in play, until you are confident nothing will happen and never leave them alone in the same room. Also, be alert when the cat is outside as even dogs that live with cats may chase them outside as they think they are fair game outdoors.

I have heard of ex-racing hounds even being able to be cat-trained so unless your dog turns out to be a real, no hope, small furry chaser you will be okay.