I understand it is forbidden to sterilize a dog oneself or through a non Jew. However if one is buying a dog can he tell the non Jew that he will only buy a/the dog if it has been sterilized, knowing that the non Jew will sterilize the dog in question. It seems this would be permitted as i do not yet own the dog and am not doing the sterilization myself. Could you please share your thoughts on this.
By telling the non Jew that he will only buy the dog if it has been sterilized might be like telling him explicitly to do so.
Sanhedrin 56a-b, Sheiltas 105, Rosh Bova Metziyah 7:6, Rambam Avodah Zorah16:13, Nemukey Yosef Bova Metziah 53a, E:OH 5:14, Beis Shmuel ibid 16