when my cat Jasper see's a dog he fluffs up and gets as big as he can and is not afraid to bound up to a dog. The other day I went to look at my neighbours home Jasper went along with me and on the way back he saw a dog the owner ended up getting the dog out of the way best she could from Jasper, Funny but scarey I'm sure the day will come when a dog will stand up to him I'll just have to wait.