A dog of two halves

I love the way a dog dumps its rear end down,

so that the rear is sitting, but not the front,

as if the rear was parking the car while the front went shopping,

as if the rear belonged to some other dog,

a pantomime dog of two halves,

as if this other dog was just filling in for the afternoon

and it had now reached the end of the time it was paid for,

and at any moment the sighted front could walk off

and leave the rear squatting blindly.