
I would say far to early & yes you should be separating them. You don't want them to be trying any old time.
When you do put them together, the ideal is leave a day between ie 13th then 15th(obviously the day you try may not be these days). It actually only needs to be one mating, on the right day, to lead to a successful litter but a fair number will have 2 matings, to be sure & as they are you own dogs, then it would be worth trying for a 2nd mating.