please help identify the predator

Today, we thought a red-tailed hawk was in the area. I immediately locked the girls in their coop. It wasn't a hawk. The turkey vultures were circling the yard. When that happens, we go looking for the dead thing. Luckily, it was not one of my chickens.

However, about 100 feet from the coop, we found the front half of a fawn at the scene of a bloody struggle. The back half had been completely eaten. It looks like the kill happened last night. The predator tracks in the mud were between 3-4" across, four evenly spaced round toe pads around a large foot pad, with no signs of nails. We are trying to identify this critter. I'm sure it will be back tonight. We have coyotes in the area, but wouldn't a coyote have imprints of toenails in the track? I think we also have some occasional bobcats and cougars here, but not often. Fully half of the fawn was eaten. That seems like a big appetite. The girls are locked up, and I am uneasy about going outside tonight. Does anyone have a guess at what we are up against?

 

The tracks were in soft mud. I didn't take pics, but will see what's left tomorrow. The fawn was indeed born last spring. They are all born here in May. The fawns are in winter coat now, all spots gone. They are quite big, nearly yearling-size. We back up to a large regional park of chaparral and live oaks. There are coyotes, but they are very wary of humans. The occasional big cat does come down to the yards. I was also thinking that this is too much for one coyote. It could have been a pack, since the area of the struggle was very trampled, and even knocked down a section of fence. But the tracks didn't look canine. Very wide, round pads.

 

I can't see the carcass from the house. There are several trees, shrubs, and a wire fence between here and there. It's not an easy walk to get there and back, so it will have to wait until daylight. I want to know what kind of predator it is, but not badly enough to confront it directly. I know exactly where the carcass was today. It had been dragged down a little hill after it was killed, right in front of my neighbor's fence that was knocked down. I expect it will be moved/ eaten more by tomorrow morning.