I brought my male chihuahua to the vet on march 17th (08) to get neutered and his shots, and at the time he weighed 4.5 lbs (4 and a half pounds). He is about 4 months old now. I was wondering how much bigger he will get on average? I know they don't get big at all, lol. Just curious! 
) Thanks!
2-6 pounds (1-3kg)
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5-7 pounds
References :
They usually weigh 5-7 pounds on average.
References :
A show quality male Chi will usually weigh 3 – 6 pounds. Pet quality may weigh a bit more.
References :
Weight: up to 2.7 kgs (6 lbs), with 1-1.8 kgs (2-4 lbs)
http://www.thekennelclub.org.uk/item/182
References :
I STUDY NATIONAL AWARD IN ANIMAL MANAGEMENT
Chihuahua Breed Standard
Toy Group
General Appearance
A graceful, alert, swift-moving little dog with saucy expression, compact, and with terrier-like qualities of temperament.
Size, Proportion, Substance
Weight – A well balanced little dog not to exceed 6 pounds. Proportion – The body is off-square; hence, slightly longer when measured from point of shoulder to point of buttocks, than height at the withers. Somewhat shorter bodies are preferred in males. Disqualification – Any dog over 6 pounds in weight.
http://www.akc.org/breeds/chihuahua/index.cfm
References :
akc.org
dog owner
trainer
Not much bigger than he is right now. I have a friend who has a male chihuahua, and she told me that she had to work to get him to weigh in at 5 pounds so the vet would go ahead and neuter him.
References :
2-6 pounds (1-3kg)
References :
http://www.dogbreedinfo.com/chihuahua.htm