I didn't read all the posts, so someone may have said this already. When I look at the bones fabric, all I see is a "blur". All of it just runs together. Neither the dogs or the background really grab your attention. The values all seem the same to me.
The second one with the light background really "pops" the dogs. You don't notice anything except the dogs, which I like.
My second choice is the darker solid.
Make what appeals to you, though.
bkay