I don't see a lot of overweight dogs, but where we see most dogs are at activities where an overweight dog would not cut it. All the dogs at the working dog club are in prime shape due to their activity. There is one black GSD who could probably stand to lose a little weight, but he's got real thick fur and he's 6 yrs old, and he's real filled out, so it's harder to tell on him. Also at our agility class there aren't any overweight dogs. Even at the beginners classes that run before agility, there are not many overweight dogs since most are younger, 5 months to maybe 18 months is the usual age.
Where I did see overweight dogs was at Daisy's 1st OB class, there were 2 labs there that were just grotesque, the sausage on legs look. They were free fed, which is where I think a lot of the problem lies, when people just fill up a food bowl and leave it out for the dog to nibble all day and don't monitor how much they are actually eating. It's sad to see overweight labs, and it's too common. There are a couple in my neighborhood but they are fit because they are hunting dogs. One of the guys in my band has a lab who is also real fit but he's in tune with his diet.
People think Daisy is underweight because she's got such a tuck to her belly, but I think she's about perfect. You can see her ribs if she turns a certain way, but normally you can only see the last one. It's not like they are sticking out all over the place. Her waist is very trim, but her legs are fully muscled and hard as rock. I have to watch her closely though, since she's growing, she'll go thru stages of looking skinny, then she'll fill in again. Gunnar is at a good weight. I can feel his ribs under the skin and he's hard as a rock. Bruzer will fluctuate some, and he's hard to keep trim. He's overweight right now but he's very active and isn't being over fed, getting 8-12oz of raw per day. If I cut him back just a couple ounces per day over 2-3 weeks, he drops the weight off.
Wish we were all that lucky 
