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Hello,Thank you for using Just Answer. My name is***** am a veterinarian and will do my best to help.
I am sorry your old kitty has a mouth tumor, but it is good you are taking care of it tomorrow.
I would be cautious about using Metacam in a cat this old. It can be hard on her kidneys. Has she has any blood tests done to check her kidney function?
You could try applying some topical steroid ointment to her feet, and keeping her from licking it off for 5 to 10 minutes.
I have not heard back from you; how is she doing?Let me know if this was helpful and if you have more questions.