Have a look at this, how much of it was real, and how much added? The only thing that looks completely not right to me in the blood:

http://www.youtube.com/watch?v=3yq3-1aqc6w

Very Hollywood...

I was expecting some old milf with a young stud for a minute there

the bear needed a change of underpants, that's for sure.

I'd imagine they were trained animals, but it would have to be fake blood. What's the deal with the "little girl out of breath running scared" sound effect they stuck onto the bear within 2 seconds of it running? Jeez I'm not that unfit!