Millions of dogs are put to sleep every year just because there aren't enough homes. If you haven't done the appropriate testing (which is WAY more than a vet check! You would be spending thousands for the right tests for breeding!), your dogs have no show or performance titles, and your dogs (by the sound of the size difference) are not even to breed standard, please don't breed. It would demonstrate a complete disregard for the welfare of dogs and a lack of respect for those people who do breed responsibly.