In a neighboring county back in the early 80's. Some people bred their Black German Shepherd to a "pet" coyote they had. Off-spring were all black with a white underside & white crest on their chests.
What I had heard, was they set some of them loose in the county side. Country side, is very hilly with alot of timber & a river nearby.
Anyway, a couple of these black hybrids were seen killing livestock. So a group of local farmer/coyote hunters hunted them hard. They killed one of them. One of those farmers called my Dad & asked if he wanted to come over & see it. He did, Dad was told that coydog weighed 62 or 65 lbs?. I don't recall exactly now.
It's been so long ago, I don't recall now, how many they ever killed.