No more Happy Hour episodes of Clifford for you!
I'm guessing:
City Sanitation Dept cleans up after Clifford with help from some heavy equipment operators.
No cows - Clifford's into unique protein food so he goes for a fish based formula.
They won't bury him - he'll be encased in cement and become a tourist attraction. All those tourists that ignored him in life will flock to have their pictures taken with him!
Drool rag? Look at those lips. Clifford's a dry mouthed dog.
Marking on electric poles? That would be "shocking"!
I'm guessing they neutered him with the classic rope around the testicles manuever.
I don't know squat about any of the other characters in the Clifford books so I'm no help on your other questions.