DRAGON COMBAT: ATTACKS AND DAMAGE

A dragon attacks with its powerful claws and bite, andcan also use a breath weapon and special physical attacks, depending on its size. They usually prefer to fight on the wing, staying out of reach until it has worn down the enemy with ranged attacks. Older, more intelligent dragons are adept at sizing up the opposition and eliminating the most dangerous foes first (or avoiding them while picking off weaker enemies).

DRAGON ATTACKS AND DAMAGE TABLE

ATTACKS DESCRIPTION:

• Bite:
  Bite attacks deal the indicated damage plus the dragon's STR bonus. A dragon can also use its bite attack to snatch opponents if it has the Snatch feat.

• Claw:
  Claw attacks deal the damage indicated plus half the dragon's STR bonus (round down). The dragon also can use its claws to snatch opponents if it has the Snatch feat. Claw attacks are secondary attacks, requiring a -5 penalty on the attack roll (many dragons take the Multiattack feat to lessen this penalty to -2).

• Wing:
  The dragon can slam opponents with its wings, even when flying. Wing attacks deal the indicated damage plus half the dragon's STR bonus (round down) and are treated as secondary attacks, requiring a -5 penalty on the attack roll (many dragons take the Multiattack feat to lessen this penalty to -2).

• Tail Slap:
  The dragon can slap one opponent each round with its tail. A tail slap deals the indicated damage plus 1.5 times  the dragon's STR bonus (round down) and is treated as a secondary attack, requiring a -5 penalty on the attack roll (many dragons take the Multiattack feat to lessen this penalty to -2).

• Crush (Ex):
  This special attack allows a flying or jumping dragon of at least Huge size to land on opponents as a standard action, using the whole of its body to crush them. Crush attacks are effective only against opponents three or more size categories smaller than the dragon (though it can attempt normal overrun or grapple attacks against larger opponents).
  A crush attack affects as many creatures as can fit under the dragon's body. Creatures in the affected area must succeed on a Reflex save (DC equal to that of the dragon's breath weapon) or be pinned, automatically taking bludgeoning damage during the next round unless the dragon moves off them. If the dragon chooses to maintain the pin, treat it as a normal grapple attack. Pinned opponents take damage from the crush each round if they don't escape.
  A crush attack deals the indicated damage plus 1.5 times the dragon's STR bonus (round down).

• Tail Sweep (Ex):
  This special attack allows a dragon of at least Gargantuan size to sweep with its tail as a standard action. The sweep affects a semi-circle with a radius of 30 feet, or 40 feet for Colossal sized dragons, extending from an intersection on the edge of the dragon's space in any direction. Creatures within the swept area are affected if they are four or more size categories smaller than the dragon. A tail sweep automatically deals the indicated damage plus 1.5 times the dragon's STR bonus (round down).
  Affected creatures can attempt a Reflex save to take half damage (DC equal to that of the dragon's breath weapon).

Based on the entry in Dungeons & Dragons Monster Manual 3.5