What grooming tool(s) do you find the most effective to tackle the rear end of a dog with collie pants? Bandit has such a bushy butt. He doesn't get poo stuck on himself like my old Sheltie did thank goodness, but his arse hair does get knotted really easily. Is there some sort of detangler I can spray on before hand that will make it easier? Needless to say he isn't too fond of someone brushing through his thick butt hair when he's been out for a romp and it's gotten tangled. Help us.