A couple years back, a truck or trailer hauling sheep apparently went down the US hiway without the tailgate being properly secured (and without ever looking in the mirror too, I suppose).
We heard the whole deal on the scanner: sheriff's and deputies from two counties and a hiway patrol-person busy for a couple hours dealing with loose, injured, and dead sheep. (they shot several of the severely injured ones) Several local citizens also jumped to the rescue bringing their personal stock/horse trailers to contain the animals that were still running around. (I never did hear who lost the sheep in the first place)
Oh - the life of a rural Montana sheriff
And then there was the time my wife was headed to town on the back road and came along some lady with a pickup trying to load some pigs. They weren't her pigs - she just found them in the road and was trying to keep them from further harm and/or straying. Turned out the pigs belonged to the local "Hoot" colony. They had just bought them and were trying to bring them home.
We used to have a paint mini-horse that could let himself in or out of any fence. Neighbors would call and say that he was out by the county road, and I would just reply that he would come home for suppertime. Usually by the time they called he was already back home anyway. We finally sold him at xmas time to some folks who had a little girl to ride him.