An Unwanted Dogs' Mystery Trip ?

Just imagine if the sack falls off the car; There wouldn't be a doggone pet found living inside it.

That actually used to be a common thing to do with unwanted kittens and puppies. Usually not done with older animals

You're right ... I found the image with the dog and the 'sack, bricks and canal' idea for a meme
just came to my warped mind :~)

People were pretty f**ked up back then. Granted we still have people that want to get rid of cops

All is well till you arrive and the sack is missing

Well, Your 'problem' solved itself ! :~)