@jenniferever:
thanks again for all the advice; ive bought a baby gate, and he seems to be more open to seeing the cats, when he's behind it. im surprsed about what you said, christyrutherford! id have thought the comforting would be good for him, but ill try not to. i have taken his blanket form the crate he came with, and laid it over where the cats sleep, and have laid the blanket they used to sleep on over his doggy bed. the cats havent gone back to the spot i covered with his blanket, but he doesnt seem to mind their scents.
Comforting an undesired behaviour will reinforce the behaviour. Let me try to explain. If, say, during a thunderstorm your dog cowers, hides under the bed, screams, carries on, etc., and you cuddle your dog and pet him and say to him "it's okay" your dog will take that to mean that he's doing the correct thing by being afraid and the behaviour will probably excalate. However, if you work with him to desensitize him to loud noises, flashes of light, he will become used to these things and will be less likely to react in a negative fashion. Hope this helps explain why christy said that!