If sharing a dog or picking up a stray, protect yourself.
Although dogs do not carry AIDS, it has been theorized that the virus could survive long enough inside a bitches' vagina long enough for you to contract it, or anything else, if you have sex with her immediately after an infected person.
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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.' Most bitches have a bitter-sweet taste when in standing heat and I definately recommend the aroma.
Saint Bernards, Great Danes, Newfoundlands and other huge breeds should have no problems accommodating a human male 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.
Namely: KY Jelly, (do NOT use a petroleum or oil based lubricant).
I would strongly suggest waiting until her second heat if all appears normal.