It is written that all of creation praises the Lord God. Most animals speak animal language. Dogs bark and whuff and howl. Your dog might not be howling at the moon (or sirens), he could be Praising God, or maybe when they hear sirens and howl, maybe they are sending up a dog prayer because most dogs know what an ambulance is and why?
I don't know. I can't speak dog. So who knows if he's praising God or praying?
I heard a testimony from some lady once and she said that she was visited by Jesus Himself, and that He said at one point to her, your cat contemlpates God better than you do! I think He was kidding around with her but perhaps it is true also? She said she laughed and hadn't ever thought that cats think about God. And that's when Jesus brought up the scripture about the stones themselves would cry out God. So that's something to ponder.