Let's take for example a Lion which has as you say 2 claws and one bite, it would make two claw attacks (each at a +7 bonus) dealing full damage for each one (1d4+5*) and then a bite attack at +2 bonus.

There is a pretty good monster handbook by Ur-priest (which might cover this aspects; but I am not sure) and another one focused on Natural weapons, so you might wand to check them if you have more questions concerning monsters and/or natural attack routines.


*Which is weird since large sized claws should make 1d6...