For the best kind of dog, given you’re a smaller woman looking for a male (I’m assuming “m w m dog” means male with male dog?), I’d steer you toward a medium-sized breed—something in the 40-70 lb range. My Mastiff’s huge (over 150 lbs), and while I love his power, that might be a lot for your first go, especially with a smaller vaginal size. My Pitbull’s closer to 60 lbs, and that’s a sweet spot—strong but manageable. Breeds like a Labrador, a leaner German Shepherd, or even a Boxer could be perfect for you. They’re big enough to, uh, “get the job done,” but not so massive that it feels overwhelming. Look for a young, healthy male, maybe 2-4 years old eager but past the hyper puppy phase. Temperament matters too go for a friendly, chill one you can bond with. Shelters are great for this; spend time meeting them to see who clicks.
Honestly, it can sting a bit the first time, but it doesn’t have to be bad if you prep right. Your “egg-sized” reference is helpful dog cocks vary, but they start thinner (tapered) and swell with the knot, so it’s not like fitting a big round thing all at once. My first time with my mutt, it was a sharp stretch at first—hot and fast—but not unbearable, more like a jolt that turned good quick. With your smaller size, a medium dog’s equipment (maybe 5-7 inches long, knot starting golf-ball-ish) should fit without too much trouble if you’re relaxed and lubed up. Pain mostly comes from tension or rushing it. My Mastiff’s knot gets bigger than an egg, and I’ve adjusted to it, but a smaller breed’s won’t push you that far.
To make it less painful: lube is your friend use a ton of water-based stuff Go slow get on your knees, maybe prop a pillow under your hips, and let him ease in at his pace. If it pinches, shift your angle tilting forward or back can help. Start with just the tip and work up to the knot over a few tries if needed; you don’t have to take it all day one. Trim his nails too scratches hurt more than the penetration sometimes! I keep my boys’ claws blunt, and it saves my skin. After, you might feel sore like a workout ache but ice or a warm bath fixes that fast.
As for guilt, that’s trickier but so normal. I felt it too at first society’s loud about what’s “wrong,” right? What helped me was focusing on the bond. My dogs love me, I love them, and this is just us being close in our way. Build that trust first weeks of play, cuddles, treats. When my Pitbull and I finally clicked, the guilt faded because it felt mutual, not forced. You’re not hurting anyone; you’re exploring something that’s yours to feel. Talk to us here if it creeps up we’ve all been there