I was bitten once only, and my dad too AFAIK. In my case, the dog was already a bit off and I made a sudden movement as a child. For my dad, well our family dog was 14ish and couldn’t stand without pain and had resorted to pooping where it lay, so it really wasn’t the dog’s fault when it bit my father when he tried to help it up… Ah this is a sad thread 
Another vote for a vet visit, and then a remedial visit to a good behavioral trainer. You pressed a fearful, reactive, upset dog, and your attempt at dominance got you bitten. You need to relearn how to train without dominance but with trust.
I agree with the vet recommendation, and please do it immediately. This behavior is so far off her normal as to present significant worry.
Did you see what happened while she was outside? My first thought was snake bite*, but it could be almost anything that she could smell, but you couldn’t. Something scared or hurt her badly enough that she was not going back out there; and it may also be a danger to you. Do you live in a rural area? Any chance of bears or other predators?
My response at that point would have been to sit down quietly, just outside the door, and just be with her for a while. Usually the dog will eventually come to a human it feels safe with for reassurance after a scare. Your actions escalated the feeling of threat, instead of reassuring her.
- Or maybe there’s a ghost in your front yard. The dogs always know first!!
My cousin had a Bouvier with a history of abuse (I’m not sure the history matters, but anyway). The dog was really, really obedient but not very cuddly. You could walk him without a lead and he came when called. He got along great with the other dogs and cats. Their other dogs were all insistent on cuddles and petting and were much more sociable. The dog never showed any threatening behavior towards humans or other animals. He would just leave the room if he didn’t want any human attention paid to him.
Around 7 yrs of age, he started acting really funny. Growling at his owners and their friends, not wanting to come in from outside, starting guarding his food and toys. When they took him to the vet his thyroid levels were off. I can’t remember if it was hyper or hypo, but thyroid hormone levels can affect behavior. Once he was on medication, he returned to normal.
Take your dog to the vet.
Sounds like her behavior is uncharacteristic and needs to be examined. Good on you for asking and not dismissing it.
And for those that chastised you for the way you interacted with your dog. Screw 'em. Your dog is under your authority, they are not your equals. It doesn’t sound like you abused your dog.
Sound advice.
Unsound advice. Whether having “authority” or not, anyone still needs to understand canine behavior and reactions in order to modify same. To act without understanding is likely to get unexpected results. The bite occurred – unless you intended to get bitten, things didn’t turn out the way you wanted. You might want to examine the possibility you did something wrong.
Don’t let a personal emotional need to show “authority” or deny “equality” cloud your thinking. The dog is not conspiring to overthrow humanity. The bite occurred for a reason – or several reasons, possibly a confluence of medical issues and your methods, as other posters have suggested.
Once potential medical issues are identified or ruled out, it should not be difficult to re-establish a good relationship with the dog, if you use the right methods, which can be learned.
Bolding mine: Everyone knows it’s cats that want to overthrow humanity.
I agree that it is ridiculous to keep around a dangerous animal. However, this was one bite in a situation where a) it sounds like there is something else going on outside of normal circumstances, b) it sounds like the OP did not recognize the signs that there was something amiss and kept pushing the dog beyond her tolerance level, and c) the dog gave plenty of warning and did not bite out of the blue. Any dog can bite in those circumstances, and it sounds like this dog deserves a second chance and may well not bite again in the future. To each his own, though, we all have our thresholds of what we are willing to deal with and I would not condemn someone for euthanizing a dog they felt was dangerous.
If you DO have a dog with an unprovoked or repeated aggression problem, I do endorse giving the dog leave of this world and making room for more civilized animals. However, if you have made that determination, do the decent thing and have your veterinarian euthanize the dog under controlled circumstances (muzzled, possibly drugged at home before going to the vet). Please don’t take an aggressive dog to sit out its last days in the shelter in an unfamiliar environment where it may bite the shelter workers or, even worse, be adopted out to a family with no knowledge of its past (the dog’s history may get lost, misinterpreted, or ignored), to possibly injure or kill someone.
To the OP, you’ve gotten some excellent advice on this thread. I’m assuming your dog is up-to-date on her rabies vaccines? Regardless, you should ask your vet about the local reporting/quarantine procedures after a bite. IME, not all human doctors even think about zoonotic diseases after domestic animal bites - I had multiple deep punctures from an aggressive, sick cat, went to two ER’s in one weekend, and there was no mention of reporting the bite or asking about rabies status at either place.
Ditto the advice about going to an MD sooner rather than later - animal bites carry nasty bacteria and can cause serious infections, and your hand is both very important and vulnerable because of all the vital structures (tendons, joints, etc.) close to the surface. If your regular MD can’t fit you in, go to urgent care. If it is getting worse and there’s no urgent care near you, go to the ER. Some bacteria found in bite wounds can go from inoculation to painful infection and cellulitis in less than 24 hours.
I hope you and your dog feel better and you are able to resolve this problem.
So, how did this turn out in the end?
So far none of my own dogs has bitten, but a few years ago Tbone (he was 2 at the time) was pretty badly bitten by a family member’s dog. Some people thought the dog was vicious and should be put down because of the severity of the bite, but I felt differently about it: this was a dog BITE, not an attack. If the dog in question had actually attacked my son, he could easily have killed him. As it was, he bit him once, and it was obviously in response to pain from an arthritic hip when my son went to pet him.
So…it sounds like your dog bit, which is worth checking out with the vet and following up with a dog trainer for a few sessions.
As to leaving her around the baby, I’ve had dogs and babies…well, forever. But I never left the kids alone with the dogs. When the kids got old enough to be alone for a bit (they’re now 10 and 12 but have spend time on their own for several years), and even now, I may leave them with one dog but that’s it. I don’t ever leave the kids in the house with more than one dog to deal with…if there was a dog-scuffle, one of the kids could easily get hurt. So I put two dogs up in the garage, and let the third one play watchdog to the kids.
Hope all is well now.