Humans and other animals cannot make each other pregnant. There have been speculations that humans and chimpanzees may be capable of cross-fertilization, thus producing a chuman, but not one verified case has ever been shown. Infections due to improper cleaning could be an issue for either party. Most viruses are specific to particular species and cannot be transmitted sexually, so humans and animals cannot catch many viral diseases from zoosexual acts. However, a few uncommon but treatable infections (known as zoonoses) such as Brucellosis can be transferred. HIV is fragile and only lives in primates (humans, apes and monkeys) and is not believed to survive long in other species. Animals' and humans' bodily fluids are not incompatible, but allergic reactions can sometimes occur.

No offense but you're friend may want to seek some kind of conseling or at least have a serious sit down dicussion someone about sex. Having a dog lick her vagina is not normal. That's my opinion though.

Of course not. People can only get pregnant through sexual intercourse, and the last time I heard, a dog's tongue is definately not its penis.

Agreed. And I don't even know how long sperm cells can survive outside the body.

Sperm cells can survive outside of the body for 48 hours. (YAY HEALTH CLASS) So don't finger yourself after sex unless you wash your hands and use spermicide.