reprobate \REP-ruh-bayt\ noun
Meaning
1 : a person foreordained to damnation
*2 : a depraved person : scoundrel

He was the filthiest little reprobate one ever would see. His muzzle was covered in mud, and slobber dripped down the longer hairs. You could track his exact path across the carpets of the house, and even one spot where his tail had knocked over a vase, carefully poised on a table edge. The rest of us were so well behaved; he was giving us a bad name. At this precise moment he had his feet up on the piano, apparently trying to plonk out a tune he'd learnt somewhere. Enough was enough, he had to go. Fortunately it's quite easy to get rid of another dog, because humans always assume they've simply run away. The difficulty is when and how to do it.