You should be able to lift one leg while the whole animal is on its side skin on gut in.
Put you foot on the bottom leg to hold it to the ground, lift the other leg that's free, hold it up and cut from the inside (groin) find the ball joint, cut/seperate that and slice through to remove the leg.
You should be able to take the second leg once rolled over it's just a little more difficult.
Bookmarks