Just be careful that the vet you use understands small dogs.  You can do a little research on this but it is suggested to only use Isoflorine & IV Fluides for anesthesia.  Some small dogs have died using other products.  I do know that my friend almost lost her 7lb Yorkie this way.  Luckily they were able to bring her back.
 
Hope this helps. 
Cindy & The Gang 
