The guy (Mr. Safety, he calls himself) only agreed to adopt the kitty (Sparta) to impress his then gf (now wife), who was delighted with the idea when a friend asked if they could adopt it. That's when he wrote the song, he was overwhelmed. Sparta used to bite as a kitten. Since then, he's the more fanatic of the two about Sparta, Locky and cats in general, and can't imagine life without those two.
Ok, so you all know the story already, but I just felt like telling it again, I think it's so sweet...