Found this "udder"? In the mountains of Montana. No idea what animal it could be

Went fishing on the Blackfoot River (February 26th 2005) and saw this on the trail. There wasn't a carcass nearby that we could see, or a blood trail in the snow.

We were bout 4500 feet in elevation and very close to the Bob Marshall wilderness. In this area there is a ranch with bison and cows. I have seen bear, badger, moose and mountain lion around the same area.

There was 4 nipples and it looked to be more like an udder. We couldn't tell if it was cut with a knife or ripped with teeth.

Our first thought was a bear, but our biologist friend suggested bears have nipples spread out more like a dog does. I looked at pictures of bison and their udders were hairless. We are baffled....even samsquatch...would have two nipples.