I need advice. I went out to the coop today to find my favorite hen Marilyn with a large sore on one side of her beak. She seemed very thirsty as her saliva was very thick and bubbly so i put down a bowl of water thinking it might be easier for her to drink out of. When she opened her mouth to drink i saw a large yellow canker running almost the entire length of the left side of her mouth. I saw that this can be treated with metronidizole tablets but my local fish store only has the powder form of the medication. They said they could order it but it will take at least a week to get here. Has anyone treated canker using metro powder? If so how do i administer it? She can barely open her mouth and wont eat so waiting a week for the tablets to arrive isnt really an option. Shes my special baby so i dont want her to suffer. Am i better off euthanizing her? I realize even if i treat her she will remain a careier for life.