I don't know the RULES...BUT
Ink'r, I hope you put your Coyotes in a walk in cooler or freezer until weigh-in. Phew...
If you want the hide tanned, skun it right away. Then cool hide and keep it cool.
Just take hide and carcass to weigh-in.
If you don't keep Coyotes cool, Blow Flies & Larva may add an ounce to overall weight
But the heat and Sun with cause rapid dehydration/weight loss to a dead Coyote.