Wish I could help you but I have a double problem..................if the dog isn't chasing the cat, the cat is chasing the dog! It's embarrassing!

All kidding aside, I don't know about "throwing " the puppy bomb, what if you accidentily hit one of them? I've always thought you just shake it at them. That has always worked for me.

Another thought is those air pumped water pistols. Gets a little stinging action happening with out hurting the animal, if the plain old water bottle doesn't work.

Good luck! Uh, can anybody tell me how to stop a cat from chasing a dog? It's not for me, it's for a "friend".