Mare, never tried. But as for canine pussy? I see some people on here post that it doesn't really compare to human pussy, and I'm inclined to agree. It's definitely different, hell, better than human most of the time. Longest for me so far would be close to 10-15 minutes I'd have to say, and I was focusing really hard not to cum. If she's in heat and really working me, maybe like 5ish minites. In contrast, the longest I've lasted in a human female is closer to an hour. Canines just feel all around tighter to me, combined with the temperature, going balls deep is definitely a gamble each time.