What's this song from rob and big?!

i got the episode "best, worst, and unused" from rob and big on itunes (its free on itunes anyone wants to just get it and help me) and theres this part where they talk about best pet and worst pet and when they talk about the dog being best pet, theres a song in the background and i was just wondering what it would be!. i only remember that it says "smile more, frown a little less" sorry thats all the lyrics i can remember!. the only way you could probably help me with this is if you get the show on itunes!. its free, so im def!. not asking anyone to buy it!.Www@Enter-QA@Com

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