Shaking like a dog s---ing bones.
He's a hard dog to keep under the porch.
Dog in the manger.
Just like a dog chewing on a bone.
Digging up bones.
Don't look a gift horse in the mouth.
Why buy the cow when you're getting the milk for free.
My mom used to say," Oh you don't know from adams all fox."
I think she meant adams off ox.