My crazy Chocolate Lab took care of our possum. Of course, he played possum, but he hasn't come back either after being carried around the yard for ten minutes and shaken like a dust mop.
The exchange rate for possums, BTW, is two Nutro Chicken and Rice Sticks each.
And I brushed the dog's teeth and wiped her mouth with Listerine. Possums smell NASTY - especially on an affectionate dog's breath!