grappling clarification:

[wuhan]

Grappled creatures cannot make attacks of opportunity.
A grappled creature takes a –2 penalty on all attack rolls and combat maneuver checks, except those made to grapple or escape a grapple.
Grappled creatures cannot move and take a –4 penalty to Dexterity.

does the -4 penalty to dexterity stack with the -2 to combat maneuver checks? so you'd have a -4 CMD?

if a dire bear is grappling a PC. And another PC bull rushes the bear, away from the grappled PC, does that break the grapple?

[Oladon]

You take a -2 to combat maneuver checks (CMB), and a -2 to your CMD due to the Dexterity penalty.

No, a bull rush doesn't break the grapple.

Edit: Also, where are you getting that grappled creatures can't make attacks of opportunity? They can...

[wuhan]

http://paizo.com/pathfinderRPG/prd/glossary.html#_grappled

grappled: last line in the paragraph.

[Oladon]

Ah. Good catch.