lol ive seen mny times, especially dogs mating through crates etc, or just tearing them open to get in or out. were there is a will, ther is a way! oh by thw way, females by non prized genes will retain them for years, and have been know when bred by a mutt, to then throw out mutt pups when bred even to other prized dogs. seen this myself only with one Doberman female that only got barely poked after bred to several amle, then let out on short leash on way home at rest stop for second it took for mutt to jump her and immediately kicked off, and she threw out all mutts, for next two or three breedings, that i personally saw.. so possible i know. sorry, so probably why most sell or destroy a female when a mutt or other has got on her..