Suing is dumb.
No, you can not sue your OB Gyn if you get pregnant after having tubes tied. All patients sign a paper that states that the surgery is only 99% effective. That is the scapegoat for the ones that do get pregnant.
No. He can not do that.
You can always be sued. In such a situation, your wife will probably sue you for divorce, and the pregnant woman will probably sue you for child support.
Before you had the operation you should have signed a paper giving them permission to do the operation therefore you have no grounds to sue.
No, you cannot sue him.
If it's your dog that's pregnant, it's ultimately your responsibility.
No, If she is under 18.
Ask the vet.
You can use for child support, but not for getting you pregnant.
Pregnancy is a known risk of having sex, even with birth control.
Probably not because the doctor should have informed you of the uses and risks which would include incidence of pregnancy.
No, because no method of contraception is 100% effective--people do get pregnant after tubals, just as men can occasionally get a woman pregnant after a vasectomy. It is rare, but it happens. Tubals are about 99.5% effective at preventing pregnancy: http://www.contraceptivetechnology.com/table.html