Cats keep on coming into the garden?

I have a little yorkiexshitzu and we allways let him out into the garden to have a run around etc but next door have recently bought two cats and they keep on coming into our garden and because my dog likes to chase after cats, he chases after them and they attack him back. Im really worried he's going to get hurt, it wouldnt be the first time he's been hurt by a cat. They also poop in my garden and i want to get a rabbit soon so...What can i do that will scare off the cats but be ok to my dog? Thanks.
 
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