I'm very happy to hear you are taking her to the vet. More people should do the same. I find it odd that so many people have pet birds and claim to "love" them, but think that a vet visit is out of the question. If it was their dog that had it's back ripped off, they would darn well FIND a vet right then, come hell or high water, public holiday or not. Every person who owns any sort of bird, unless they are just flocks of birds that they don't actually 'care' about, should make themselves aware of a vet who can help them when needed. I can't imagine that avian vets are impossible to find in the US. They certainly aren't impossible to find here in Aust., although you have to make the effort to actually look for one, which is very easy with the advent of the internet.
That said, it is absolutely
lovely of everyone on here to give all the help and support they can, and I help when I believe a situation is reasonable, but the reality is that, as you said from the start, you didn't even know what you were looking at as far as this wound was concerned, and only a proper examination by a vet can show whether she has puncture wounds and who knows what else that can't be easily seen. Just as an example, the horrendous bruising and internal damage inside what can look like a simple dog bite on an animal is something you don't want to see.
Anyway, well done on deciding to be a responsible pet owner and taking her to the vet.
If you can afford a vet, by all means have the hen checked out and the wounds treated, but chickens survive for most of us without vet care since most vets don't see chickens. As long as a serious wound is flushed daily with saline or soapy water (and rinsed), any bacteria that has accumulated on the wound over a 24 hour period is flushed away, preventing infection form taking hold. If you have a vet assume the patient care for treating this chicken, it's likely to end up being a pretty expensive chicken.
There really is no magic or technical process involved in wound care. It all involves two things : flush the wound daily and keep it moist while it heals. Your chicken will do the rest.
I have a different opinion about a few things in this post.
"If you can afford a vet, by all means have the hen checked out and the wounds treated, ..."
Honestly, if you can't afford a vet (especially in an emergency), you can't afford a pet -
any pet. If you have a pet and can't afford a vet, you need to be willing to euthanize a pet
quickly and painlessly in the event of serious injury or illness. Keeping a suffering animal alive is cruelty, plain and simple.
"...chickens survive for most of us without vet care since most vets don't see chickens."
Very much a matter of opinion, and I don't believe it to be true at all. You only have to look at the number of people posting about how many chooks they have that die, to see that a vet would come in very handy. As for not many vets seeing chickens, avian vets are around if people could be bothered to look for them.
"As long as a serious wound is flushed daily with saline or soapy water (and rinsed), any bacteria that has accumulated on the wound over a 24 hour period is flushed away, preventing infection form taking hold."
This is incorrect. Infection is still likely to take hold with a serious wound.
"If you have a vet assume the patient care for treating this chicken, it's likely to end up being a pretty expensive chicken."
Most likely, and that's the price that responsible people pay for having pets and caring for them properly.
"There really is no magic or technical process involved in wound care. It all involves two things : flush the wound daily and keep it moist while it heals. Your chicken will do the rest."
Again, a matter of opinion. In a human patient, this chicken would be needing some serious skin grafts, not to mention the muscle and who knows what else has been ripped away, plus none of us can see what's gone on under the wound or if there are punctures, etc..
No personal offense to you at all, but I really wish that people would not make excuses for themselves and others not taking sick and wounded animals to the vet. The more people who make excuses, the more "normal" and "acceptable" this sort of behaviour becomes to others, who then do the same. It's not acceptable, end of story, and if more people would call others out on it, the less suffering we would see of innocent animals that depend on humans through no fault of their own.
I hope this chicken survives. After the amount of suffering it has already been through, it deserves to.