For now, separate them. But, I highly recommend you don't breed them at all, especially not at a year since it is still too young (minimum age should be about 2 years). Not only can breeding lead to heartbreak, especially if you don't know what you're getting into, but if you don't do it right and for the right reasons you'd be a BYB. BYBs are the whole reason there are so many dogs getting killed in shelters. I also suggest that, if you aren't planning on breeding responsibly, you spay and neuter your dogs.