#1 Very rightly so, you missed out on X breed mutts or off spring off many mutt bitches through the generations, aka former street dogs or dumped former house pets (bad mannered owners). From the material out there it seams that nature isn't kind, so they get use to pretty much anything that comes their way so being bred by male human zoo once or a group is the least path of resistance to survive. They are easy game with bowl/s of food, hence why some zoo pussy lovers prefer them over many years with tied & tested methods.
#2 You did touch on bred then pregnant bitches + given birth - that's one main ways for a human male to be able fully mate (length + girth) with a much smaller bitch even if it's her first time with a human. It even surprises me to this day with what can be done; If you can get head in with some ease then some more for wiggle room (relaxing muscles for further expansion) not all about depth at first but more you slowly plunge it in her on a continuous basis more deeper she will go to some point in many cases, all in her lubed up wet out stretched pussy. (personal experience) To where the bitch does in heat to out of heat is on each dog, though many will take it on both some on either.
#1 + 2 A: Had a friend that adopted a smaller street X mutt bitch... Yes he'd been feeding her & screwing her for weeks on end she'd return. Vet visit & cleaned up, his own love machine on 4 legs was his words; He wasn't joking, when he told me 'to go forth with', while had I her for a week which turned to 2 weeks while on dog sitting duty. Regularly if not daily as he asked, I loaned him a soft bed & few hours to reconnect before he left with her. A natural progression of a trusted friendship with both & regular visitors, need not to say all the pleasure the small group of us have experienced with her outright, not as tight nor shallow any more but loosens up to lot of depth from all the cocks that have stretched her out with of many wild shaking spasms (orgasms) either while holding her tight or after releasing her. A bemused & loved (not abused) lady to all of us.
#3 The second is the long & hard way by slowly easing of the said muscle entrance area with one's fingers - lots of foreplay with lube then many hours of time. It's something for die hard zoos with much loved pets that all too willingly allow it to happen (brilliant). The results can vary.....
#3 A: Another closet zoo maybe? (reading inbetween the lines of his life style + remarks) He had her from a young puppy, (not spayed - X staffy) I got on know her early on from often chatting to him passing the time (friendly), he passed away in hospital the bitch dog was most likely in her 3rd season & the family offered her to me..... I accepted with wonder was my thoughts about him was correct. It didn't take long to see that I was 75% right, foreplay/licking cock normal when playing with her bits - so relaxed & forthcoming. Anal wise not her first time, she loved it. Pussy wise (vice tight) - a virgin but I could tell he'd played with her with this but never got it passed her out lips. Up to her next heat I worked on her forbidden hole, fingers lube & time. When her natural mating urge came two of us there, no bother - swollen muffin twitching with my every touch. I'd stretched her enough & doggy style sent it deep, on the second push gone was her virginity & was loving the wet warm pussy around my member later filling.
The other person was a first timer, always wondered, that day he became a real man + zoo lover. His eyes glued to what was happening me explaining, him wiggling it around trying to find her vaginal tract past her outer lips, me pulling her butt up, his push - eyes closed loud gasp as he felt her warmth & wetness on his full length. Him pumping her like a cheap whore (lots of slapping) going for the long haul, me telling him during this is why men fuck animal pussy mostly dogs, telling him to hold her tight as she will try to pull off shaking from her spasm & to slam her hard on his last stroke to fill her up - him looking at me with deep worry. My cheeky remark, you cannot get her pregnant - give it to her.
That release of fear & knowledge increased his pace then rightfully so slammed it home hard, grunting like wild man her shuddering & trying to pull as his grip getting stronger as they both came hard. Telling him to pull out & let her lick him clean, he does but that rough dog tongue got all him hard again poor soul. So instructed him on screwing her missionary. He was fucking her all night & next day seeing her going back & fourth from me to him like a horny dog. Over that heat cycle I let him get all the time he needed plus with myself, she didn't ask for much more - the sex never stopped after her in-heat cycle we both enjoyed then others was asked sometimes bringing with their own to share.
Third that she's a natural flexible bitch dog that will take any cock in her wet hole given you present it enough times to her to allow her relax her inner muscles for your head of your penis to slip in & past her two inner muscles to you fully in her warm hole.
