Cam catches a summons while he's in the middle of Atriama. He's seen it before, it's fine.
"Lemme look it up." Computer computer. "...apparently lidocaine will work but can be risky in cats, though in a very small localized amount you'd almost certainly be okay. Also this is me assuming that you are like a non-sapient cat of the kind I am familiar with, pharmacologically speaking, which I don't know if I should be certain of..."
"I was mostly fine on poppy seeds the first time around. How long would it hurt for, if you're putting a new one back on right away?"
"Oh, not long at all, but you do have to hold still so I don't miss and have your new leg joined up wrong."
"Well that's fine; I was afraid it was going to be a quarter-moon. I really couldn't have done that, leaving ThunderClan without a medicine cat for any length of time."
"ThunderClan would not be without a medicine cat for any length of time. Do you want me to do this literally now?"
". . . It should wait at least until Fireheart and Sandstorm return. Maybe longer."
"I appreciate the offer, though. A lot."
"Tell me more about Twoleg medicine. I bet we have a lot to learn from each other."
"You might have to be more specific."
"Hmm. Diseases? Do Twolegs get greencough?"
"Yes, and it's not all one disease, it's any bad enough lung infection."
"What do you treat it with? We mostly use catmint, which works better than anything else, but we still lose a lot of kits and elders."
"Different things, you have to treat whatever the underlying effect is. Antibiotics if it's bacterial, antivirals if it's viral."
"I have no idea what you just said."
"Most diseases including greencough are caused by living things too small to see, and those come in broad categories, mostly 'bacteria' and 'viruses', and there are different classes of drug that can kill those without doing too much damage to the patient."
Cinderpelt has LOTS of questions about germ theory, enough to keep busy until the other cats approach.
Princess is now limping harder than Cinderpelt was on her way over.
"- whoa, Princess, what happened to you?"
"I smelt a dog and then I saw it and it was so big and it was tearing apart a bird really violently - " she hops up in Cam's lap " - and it didn't notice me so I ran away as fast as I could and I cut my foot. And then Fireheart found me and I was so glad that he's alive but I still had to walk all the way back here." The way she's being careful of one of her front paws is not a way that prevents her from getting a bit of blood on his jeans.
Is it polite to pet cats in this universe. "Let me have a look at your paw?"
The main pad and one of her toebeans have a moderate slice through them.
"Do you mind if I clean this up a bit and then close it with magic? It'll sting a bit but not for long."