Back to the peridot dragon.
Since it seems to behave like a great cat, I'd give it the Improved Grab, Pounce, and Rake (Ex) abilities, like the big and dire cats in the SRD. IIRC no other true dragons have all these abilities, not even the somewhat feral beast dragon of the Beastlands.
Improved Grab (Ex): To use this ability, a peridot dragon must hit with a claw or bite attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it wins the grapple check, it establishes a hold and can rake.
Pounce (Ex): If a peridot dragon charges a foe, it can make a full attack, including two rake attacks.
Rake (Ex): Attack bonus +n melee, damage increases with age.