Dragons have bite, 2claws, 2 wings and tail slap.
Do all 6 of these attacks happen in the same six second round? Are there any restrictions on the targeting of these attacks.
From what i can find in raw, all 6 attacks happen and can have any targets in range.
Thematically it would make sense that their attacks would be limited to orientation. eg, you cant bite and tail slap the same target.
Yes, as a Full-Attack action they get all of them. Remember, though, that they don't get iterative attacks.
Im not sure im familiar with iterative attacks
The dragon can use all it's attacks on one target. If this seems odd considering the bite and tail are on opposite ends, consider that the fighter gets his shield bonus against attackers on opposite sides. Or that the fighter could, if he had iterative attacks (extra attacks granted when base attack =6,11,16) attack two creatures on either side of him.
The abstraction of D&D combat assumes that a creature is moving around in its space quite a bit, not standing facing one particular direction. Well, in 3.5, beholders had a built in facing mechanic, but they aren't in Pathfinder, so its all good.
Just like most creatures don't fit cleanly in a x by x square, because much of their mass (claws, head and neck, wings, tail) is outside the square most of the time, as the threatening implements of harm coming at brave adventurers.
"Iterative attack" means "extra attacks you get with a weapon because you have a high Base Attack Bonus."
Example: a 10th-level fighter has a BAB of +10, and can normally make two attacks per round, one at +10 and one at +5 (written as +10/+5).
A dragon with BAB +10 using claw/claw/bite/wing/wing/tailslap get just those six attacks per round. It does not get a left claw at +10, another left claw at +5, a right claw at +10, a right claw at +5, a bite at +10, another bite at +5, and so on. This is because natural attacks never get iterative attacks, no matter how high your BAB is.
"Iterative attack" means "extra attacks you get with a weapon because you have a high Base Attack Bonus."
Ahh, thanks for that Sean, i was slacking on my terminology studies :P