In my case I did have a stranger tell me that Max was overweight and in truth it was the eye opener I needed (as I thought he was fine). The next time I was at the vet - not my regular vet who had never mentioned his weight I asked her opinion (he had already lost a bit of weight) and she reiterated that he could stand to lose a bit more. Although my feelings were hurt at the time I am grateful to her for the literal slap in the face because I know Max is healthier because of it. It's not that she just walked up to me on the street either - we were at a dog training seminar so we all considered ourselves fairly educated dog owners.
I will admit to once telling a friend that her dog was fat (without being asked). It's something I try hard NOT to do but I was so saddened to see this dog go from a beautiful, bouncy lab who would always run to greet me to a dog that doesn't even bother getting up when I come over anymore. She is still a friend but didn't take my advice and her dog is fatter than ever. I have managed to keep my mouth shut since.
Mindy Tri - Feb/97
Max - Ruby - Sep/08
Rylie - B&T - June/09