Be the man your dog thinks you are.
That's actually what it says.
So here's an insurance company, selling you insurance by saying something like, if you buy insurance, your dog will think you are more of a man. While you're thinking that one through the dog is just like, "Throw the friggin ball already, dude."
If she's never impressed, then how can she be impressed? She can't be impressed because she's never impressed. What kinda fool does she think we are??