How old is he?

The trainer is Chip. The person who catches the bite is called a Decoy.

In PSA your dog can pick the body area to attack?

Look at those teeth. Fierce.

He will be five in mid January.  In PSA, you have to tell the judge if your dog is a leg dog or upper body dog.  If the dog is a leg dog, he can bite anywhere on the leg and typically dogs bite just below or above the knee with the head on the outside off the leg unless it is a flee bite where they bite the back of the leg.  Upper body dogs always bite the left bicep unless it is a flee bite and then they bite the tricep or back.  In the fend off scenario in level 2, the decoy tries to block the dog from biting the upper body, forcing the dog the bite the leg.  The other exceptions are in the carjacking scenario in the PDC and level 1 where the dog is in the passenger side of a vehicle and bites a hidden sleeve on the forearm when the decoy attacks the dog through the window.  There is also a sleeve division in the PDC for weaker dogs that won't bite a suit, but it is only in the PDC and if they pass the PDC, they can't go on to the next level.

Mine would be an arm dog.  Not that I’ve trained him to do that, but when he gets amped he bites my sleeve for attention.

I think it’s interesting to see the reasons behind dogs not biting in suits. I usually question what’s going on training wise. It took about 1 minute to get Cion biting on a suit. 

Doesn’t Cion love to bite anyway?

He does but that’s not a unique trait in working lines. Depending on the foundation work and how long the dog has been doing it, some dogs do struggle to transition from sleeve to suit. Most dogs I’ve seen do so without much issue. Lower level dogs are the ones I see struggle more.