The Breeder Said It Was A Slip Mating (no Tie) - How Could Of I Told Whether It Was / Wasnt? What Constitutes A Slip Mating, One Pump (in/out)?

A slip mating is where the male and female fail to lock, so the male (literally) slips out.  He will still have an erection and be ejaculating.  Pregnancy can still result as the male releases the sperm during the first part of his ejaculation, the later part is nutritious fluid to aid the sperm in swimming.