I am SO sorry! We are dealing with the same thing right now. Two of our hens got attacked on Saturday morning. I posted pictures (some were taken last night, so they have started healing) on my message/topic when I asked for help too!
https://www.backyardchickens.com/forum/viewtopic.php?id=101365
Here is what we did (after freaking out and asking everyone for advice! Also, I am kinda picky and overcautious with this kind of stuff (and inexperienced), so this may be overkill, but our girls are doing fine considering the trauma):
Clean the wound(s) with diluted hydrogen peroxide or betadine (iodine). I've heard saline solution too as someone above me posted, but I had betadine, so we went with that. You'll want to clean it often (at least once or twice a day). Also, dogs mouths are DIRTY, so if it looks deep, use an irrigation syringe to clean it (probably use saline solution for this or antibiotic water). I agree with JJthink regarding neosporin too! I would recommend putting her on an antibiotic. We are using Aureomycin powder, which is added to water and that is all they have to drink, that way they get it into their systems. But, I am sure any broad-spectrum antibiotic would do. Injectable antibiotics seem pretty popular among BYC-ers too, but I am sure it is preference. Keep her inside if you can too, so the would can stay clean.
Good luck!!
https://www.backyardchickens.com/forum/viewtopic.php?id=101365
Here is what we did (after freaking out and asking everyone for advice! Also, I am kinda picky and overcautious with this kind of stuff (and inexperienced), so this may be overkill, but our girls are doing fine considering the trauma):
Clean the wound(s) with diluted hydrogen peroxide or betadine (iodine). I've heard saline solution too as someone above me posted, but I had betadine, so we went with that. You'll want to clean it often (at least once or twice a day). Also, dogs mouths are DIRTY, so if it looks deep, use an irrigation syringe to clean it (probably use saline solution for this or antibiotic water). I agree with JJthink regarding neosporin too! I would recommend putting her on an antibiotic. We are using Aureomycin powder, which is added to water and that is all they have to drink, that way they get it into their systems. But, I am sure any broad-spectrum antibiotic would do. Injectable antibiotics seem pretty popular among BYC-ers too, but I am sure it is preference. Keep her inside if you can too, so the would can stay clean.
Good luck!!