baconbaconpancakes
Tourist
A human male rectum is very stretchy and when people try to prepare for knots, they aren't tearing and healing tissue in the rectum either. It still hurts in the way I described. I use streching / desensitizing interchangeably.That's not how stretching works at all. You're not physically "stretching" her vaginal walls until they tear and heal, as that would be literal sadism. The idea of stretching is that the more sex/fingering/dildoing you do the more gradually she will "open up." You also don't want to cram yourself into her, you'd want to stop at snug, but not too snug. When I've gone a month without having sex with my Newfoundland gal, when we resumed sex again I could feel that she was physically much tighter. However, after a week/week and a half of regular sex she would loosen back up again. No pain was felt, only mutual pleasure.
I have also fingered my littler gal multiple days in a row and have felt her loosen up a little bit as well, although I have not pushed things too far. You're not trying to get a bowling ball to fit into a tube sock. You'd only be loosening them up to their max potential gradually. If done right, this should be pleasurable to the female canine. For anyone new, I'd only recommend fingering as it'll give you more of a tactile feeling for snug but not too snug.
When a dog is in heat and she has spent weeks preparing for sex, wouldn't she be as accommodating as she can be?
That is slow and steady. How do you think she feels when you pump it at the max of her comfort and then you pump it one more? It's discomfort / pain until she gets used to it and then it you pump it again. Stretching necessitates pushing limits and slower just keeps the pain lower. If your dog is showing nothing but pleasure her pain can't be proven but I can reason that it exists using my own experiences, knowledge of dogs, and working from there.I think here is simply a misconception what stretching means. I have a pump dildo with no core. It is just a thick rubber hull. I put it in her and move it back and forth gently for a few minutes and pump only a little and continue to move it in and out. Meanwhile I kiss and cuddle her and watch her getting one orgasm after another. You pleasure her like that for 2 to 3 weeks and she gets wider and wider. What you NOT do is, put it in and pump it until it is stuck. That would most likely hurt your dog.
PS: Of course using enough lube is a must
Pain and pleasure are not mutually exclusive so she may be feeling the full pleasure of sex too. Most of what I enjoy like being bred by huge dogs involves pain. A dog's muscle contractions and physical responses are involuntary so she will have them if she's being stimulated in the right way regardless of her other feelings. If a dog gets rubbed too vigorously on her clit (overstimulation) she would still respond physically and you might think she loves it until she shows displeasure like by moving away.
Dogs don't always show displeasure when they should because they have high pain tolerances and want to please their owner. When offered something they do like, the pleasure aspect, dogs are known to endure discomfort / pain. It's could be somewhat similar to baiting, except in this case sex is the bait and stretching is endured part. Check out training animals for sex if you haven't seen it.
I consider stretching dogs a gray area. A risk to be avoided by getting as large of a dog as possible. I won't call people abusive for doing it slowly and carefully but good luck getting a horny compromised zoophile to not make any mistakes over the weeks it might take to strech a dog.