My dog is spayed but she is big enough for me but yes it does take away their sex drive, i believe its unnatural to get rid of those organs, God gave them to animals for a reason and not to just be cruely taken away. Its only human nature to have sex with anything they can get their hands on, esp animals lol. With female dogs, there cervix is tightened when not in heat and loosens when in heat, due to a female dog getting spayed itl never loosen and the best you can hope for is to at least let her have one heat before spaying and meanwhile try and train her to enjoy sex, just dont actually fuck on her first heat as it is a point in there life in which is similar to our puberty, she is maturing. Afterward go for it. With my dog she was spayed halfway through her heat and her vagina is about half of what is was when she was in heat. All i can do now is fit my tip in and cum inside her, i dont consider it sex though since i am still masturbating and just jizzing into her.