[i'm a he/him but mention my cunt - pls do not misgender me, i am not a female]
my small dog (terrier/chihuahua/staffy/other) is coming up to 11
years old and he was neutered at 10 months (so for a smaller dog he had gone through puberty yes) just before I got him and he begs me for sex every day and has actively wanted it for the past 10 years and whines if I don't give in, to this day lol. i have an entire male now too, and he gets very jealous any time i play with him. it's really hot. he was always prone to being quite possessive and he is quite protective/territorial over me, and did used to hump things so after jerking him off a few times and being surprised to see that my neutered dog was not only interested, but fully knotted almost immediately, we just went from there and after gently positioning him above me in missionary and jerking his sheath even once, he immediately started humping desperately trying to find the hole and grabbed my waist with his paws, felt the wetness, and immediately plunged his entire cock into my cunt and fucked me hard and frantic and fast until he knotted me and he had a strong pulsing orgasm knotted inside me, just minus the cumshots. ever since then we've fucked multiple times a week or month, for the past 10 years and he hasn't slowed down that much.
he scratches at my door to get it, scratches at me for it and whines and yes he actively mounts(missionary), humps, fucks me hard and fast, and knots me for 20+ minutes. his cock and knot still get rock hard. he's ejaculated full cumshots a few times over the years when stimulated the right way (yes -- they still can, there's just no sperm in the semen and yes it's uncommon, he's a little unicorn lol) and quick enough with enough lubrication, or anally stimulated, but he very visibly and obviously orgasms and loves it. i got very very lucky with this boy, i am so sure it's the chihuahua (and a bit of staffy) genes, they're crazy little sluts with impressively huge cocks for their size - my boy is as long as, almost same size knot, and just a little less thick than my other dog who is 15+kg heavier than him :3