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My name is***** and I am sorry to hear that Rocky is has a fast growing lump under his chin.
Can you examine the lump and describe it more? Is it hard, firm or soft? Does is appear to be attached to something else, like his jaw bone, or is it "floating" under the skin? Is it painful if you squeeze it? Can you see evidence of the lump inside of his mouth as well?
Please let me know the answers to these questions so that I can help you and Rocky tonight.
Can you send a picture of the mass so that I can see exactly where it is located?
Is there only one mass or are there others, like on the other side of the jaw or down at the base of the neck, near the shoulders?
Okay, great, that is really helpful.
So, possible causes for the mass include (but are not limited to)- foreign body under the skin, like a grass awn, cactus or plant spine, etc, lymph node (lymphoma, swelling from sinus infection, fungal infection, etc), salivary gland blockage, salivary gland tumor.
You are right to get him to the vet tomorrow. They can put a needle in the mass and determine it's exact cause and prescribe treatments.
Does this help? What other questions do you have?
I would wonder about something internal making him more thirsty.
All of the possible causes I described can grow very quickly, like in 24 hours or less.
How is Rocky tonight? Did you take him to the vet today? What did they think about the lump?
Thank you so much for the update. Your vet really did a great work-up, now you just have to wait.
Best of luck to you and Rocky.
PS- If you would consider rating our conversation, I would really appreciate it. I strive for 100% customer satisfaction.