It's not uncommon for animals to walk out onto the ice, fall through, and eventually drown, and you can use it as a hunting tactic by scaring the animal away from the shore. You need to take some care to ensure you don't fall through yourself, though, when recovering the remains. I typically gather a pile of branches (in case I do fall through) at the shore, drop everything carried, and then crawl out on my belly to the corpse. I then pull it to me, drop it, crawl a tile back, pull,... until my character is finally at the shore, at which time I can start the butchering.