Ironically, I have the biggest cat and smallest dog in the whole wide world...Leo, my cat who is 3 yrs old weighs 15 pounds...Roscoe my Yorkie weighs barely 2 pounds...Roscoe restlessly chases Leo all around the house and there is no stop to it...I have been saying very firm "no"s and "stop"s but it seems like Roscoe is too obsessed with Leo to give up...Leo on the other hand, who hates the world BTW, hisses and meowss couple times but he also gives in...Under no circumstances I would let go off either one of them but sometimes I miss the peaceful days with no barking and meows 
