Life's A dog is a song from the PC game Sheila Rae, the Brave that the bully dog sings to Shelia Rae as he complains about living in the doghouse and not getting respect, here's the full official song version
My life's a dog ruff ruff, It's ruff ruff been a dog, ruff ruff
I work all day while kids can play, it's just not fair at all ruff ruff
His life's a dog ruff ruff it's ruff ruff been a dog,
Kids throw a stick he fetches it, he gets no rest at all.
I want respect, I know I'm not perfect.
Yeah why are you always in the doghouse?
Cause I'm dog ruff.