Verified answer

Its common for iguanas to drop there tail if they are scared its kinda a safety thing in the wild.

You may need to see a herp/reptile vet if the tail didn't break in a clean break. Need to keep the enclosure super clean. Betadine bath maybe needed. The tail should grow back, the tail will not look like the rest of the body color wise, and the iguana will never be the length that it would of if the tail didn't drop.

http://www.greenigsociety.org/tailloss.htm

http://www.iguanaden.org/health/tailloss.htm

http://www.anapsid.org/tailloss.html

Here are some possible herp/reptile vet listings - find your state/country:

http://www.herpvetconnection.com/

http://www.anapsid.org/vets/#vetlist

Sites for you to read:

http://www.greenigsociety.org/ - http://www.iguanaden.org/ - http://www.anapsid.org/iguana/index.html

A great book to read and have on hand:

Iguanas for Dummies by Melissa Kaplan

Yahoo has some great sites for Iguana owners... these groups helped me and still help w/ questions .. if you'd like to join:

http://pets.groups.yahoo.com/group/BabyIguana/ - http://pets.groups.yahoo.com/group/IguanaDen/

wow its fine but the other awnsure has it covered