Elka's weight, to date, has not been a problem for us to maintain, and well. The fact that she's oversized (i.e., taller than she should be) is added incentive, as I don't want undue stress on her joints. Those need to last her a good long while, you know!
Pet obesity can be a problem, though, especially because dogs and cats are ultimately at our mercy for food. We can feed them adequately, or too much, or not enough. Adequate is the goal, obviously. A dog (or cat) in a home setting isn't necessarily hardwired to stop eating when "full". What does "full" mean to a dog, anyway?
Of course, looking at her like that from top down (and she kind of hunched, I admit, and turned around a bit to see what exactly I was doing back there), she doesn't look all that skinny. You can see the tuck in, certainly.
Here's another angle, though:
And of course the side view, for the tuckup:
Elka does not have as much "bone" as some Dobermans people see, and she's been accused at least once of being a Greyhound mix (sigh) (though somebody else once leaned out of their top floor window and asked if she was a Greyhound, I think they didn't really know anything about dogs).