Hi, I was wondering when a male dog starts to produce fertile sperm... I have a 2 year old bitch in season and a 4 1/2 month old male pup and she is half way through it and the last couple of days my pup is trying to (well you know) her so any information would be appreciated I am keeping them apart for the moment anyway..Thanx

It is just about possible so keep them apart.

Thanx Brainless :)