Getting Started The female dog normally comes on her first heat between the ages of nine and fifteen months. Attempting intercourse with her at this time is not recommended since these changes in her biochemistry are confusing enough without having you trying to do wierd things to her.
I would strongly suggest waiting until her second heat if all appears normal. However, this is not always true. I will go into further detail about signs of discomfort and warning signs later. Saint Bernards, Great Danes, Newfoundlands and other huge breeds should have no problems accommodating a human male.
Prepararation is the key! In preparing to have sex with your dog, you'll need to run down to the local drug store and pick up a few things. Wet and Astro Glide, both of which can be found at your local adult shop, work as well.
Also, if you're near a medical or veterinary supply, surgical lubricants are good too; latex gloves. If you're going to be messing around with a stray dog or a dog you do not own it doesn't hurt to rubber up!
If sharing a dog or picking up a stray, protect yourself. Remember also that if she has a yeast or bacterial infection, you could get it too; surgical soap. Cut them nails down and file them. You'll also look stunning with your new manicure: Buy these with everything else if you really want to squick the counter people: You may wind up getting bit, which may mean changing your name to John Wayne Bobbitt. This cycle lasts for between seven and nine days and is in the middle of the complete heat cycle.
If the discharge is a dark, blood red, she's just coming into or going out of heat. She may say no the first time. Once you're both consenting, you may consider some foreplay. Fingering her will bring you both hours of joy and amusement: The clitoral ridge is fairly prominant so easy to find. Rubbing this will cause her to start thrusting and she'll love you for every moment of it.
If she's your dog or if you're certain she's healthy, you may want to engage in some 'puppylingus. With all teasing done, it's time to start your engines! The vagina of a female dog takes a sharp turn upward so you will have to enter from a seventy-five to eighty degree angle.
The average body temperature of a dog is degrees Fahrenheit so expect her to very hot and moist. The same rules apply except be sure and use an excessive amount of lube and be very careful. You can do a lot of damage if you try and force her and that'll be a difficult one to explain to the vet. They do not come into heat and very few show interest in sex.
Anal Sex The same rule of thumb for size applies to anal sex as well. There are some dogs that like anal sex, others that tolerate it, and those that can't stand it. Most dogs will not be immediately comfortable with anal sex but if you choose to continue, instructions on how to do so follow.
Your dog is not suited for anal intercourse. Start by touching the anal area of your dog and let them get comfortable with it.
Do not dive right in and insert anything. Wait until they freely alow you to touch under their tail. While touching around their tail, wear gloves. Numerous worms and bacteria which can cause a variety of illnesses can be found in dog feces.
The result could be a nasty infection or a case of tape, ring, or hookworms, among others. Once your dog is comfortable with you feeling around their anus, try inserting a VERY well lubricated, gloved finger. Do this over and over again until your dog seems comfortable with it. Gradually increase the number of gloved, well lubricated fingers you use until the number of fingers inserted comfortably represents the width of your penis.
You may then attempt anal intercourse with your dog.