Oh, bull puckey! The dog with the little girl on it is happier than a pig in a walnut orchard.
I respectfully disagree. The girl is wearing footwear that applies additional pressure to the helpless animal. The degenerate who posted the picture is also unaware of the scowl on the dog. In contrast, the Palin pet is actually smiling in one of the pictures because young Trig is barefoot, thus making the experience a happy, comfortable one for the dog. Furthermore this of bonding between human and dogs is typical of the Yup'ik culture. I applaud Governor Palin for upsetting liberals.
I had not heard that idiom before. "Happier than a pig is slop" is familiar but, yes, you're right. A cursory web search does show that pigs are indeed content in a walnut orchard. Thanks for the info, FRiend!