Here are my questions:
1. should I pursue him through small claims and if so, is it a hard thing to do considering that he is from another state?
You can go through small claims for damages and it will be where the event occurred. I am not sure if he can try to move it to his state. Generally, in civil court (not small claims) a defendant can move the venue depending on circumstance. Small Claims is set up to be very "user friendly" and hence why many attorneys are not familiar w/ it- it operates a bit differently than normal courts. Also, each state's small claims court has its own rules. If you want to pursue this, when you file w/ the clerk at small claims, as if the defendant can move the venue.
2. should I instead file with my homeowners insurance and let them go after him?
I dont know about the extent of the homeowners coverage. Can you speak to your agent? I am sorry I cant be of more help.
3. even though the event was free, my only purpose for booking rooms at the Anaheim Hilton was in order to attend the event. Can I sue him for the one night's room charges since I had to stay with Cujo and miss the event?
This is actually the most interesting to me, and I think where you have the most "bite" so to speak. Generally, a hotel owes a heightened standard of care to its guests. In you case, the hotel was pet friendly? So it was on notice of dogs on its premise and allowed it. By doing so, I am sure they have had some regulation regarding pets on its property, and there probably were similar incidents before. You need to do more research but if there were similar incidents on their property then they should have been more diligent in regulating how dogs should be walked on its premise (leash, etc.) The reason why I said "heightened" is b/c the tort law of negligence varies by state. If you really want to pursue this, you should speak to an attorney in that state and ask for his/her advice. The attorney can easily draft a letter to the hotel in your behalf.
4. shouldn't anyone walking a dog in an area where other dogs are present be expected to be able to control their dog at all times. Considering that this 12/13 year old girl had 2 dogs, should she have been allowed to walk them by herself?
Was this dog owned by the girl or the parent? Generally, parents are NOT liable for the torts of their children. I think it gets tricky b/c it was the girl walking the dog..not the dad.If you pursue this, you are going to name the dad, right? I find potential problem in that b/c it technically wasnt the dad's error. If you can find out that the dog has bitten/attacked before, then you have a MUCH stronger case against the dad.