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Your dogs are safe.

https://www.backyardchickens.com/threads/trying-to-treat-canker-pictures.1059859/

Have you tried removing the pus?

I just thought of something... Wet pox looks like that too.

If it's canker they can get it from sharing water and food dishes.

If mine I would treat with Baytril and metronidazole. As for where to buy them, I would call the various pigeon supply sites and ask if they ship to Canada.

Welcome to BYC, sorry your hen is sick. :hugs Yes, it could be a bacterial infection, or possibly cancer.