Personally, I bought ONE dog and thats been enough lol. Like you say, he is the energizer doggie, he keeps going and going and going. Sometimes he follows everyone around but it NEVER says anything about any interaction, like "pets poochies head" or "throws a bone for Fido", SO I quit getting pets...since I don't see much use for them lol. Guess $500 isn't bad though since they don't eat and you never have to take them to the vet LOL!