Do you not have a contract with the breeder t neuter at a certain age? if not I would wait until ATLEAST a year. large breed (and in your case extra large) really shouldnt be done at 6 months, its alot better for a growing puppy to grow properly, by neutering young you can do some growth damage on the ...bones i think it is, cant think of the other name grrr. some one else will chime in Im sure.