I am going to fill out and adoption paper for this puppy?

http://search.petfinder.com/petnote/disp...

Has anybody ever filled out an online adoption form? Does the shelter usually make it a first come first serve type of thing? I really want to adopt this puppy, and I would like to know..what are the chances of getting him? Thankyou.
Update: Could somebody also tell me some basics on Chihuahua's? Their personalities, etc..
Of course I am going to read up on them, but some pointers would be great.
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