Thank you very much for the additional information.
The most common reason for an older cat to begin having increased vocalization is a condition called hyperthyroidism
. This is a very common condition in older cats, and is fairly easily diagnosed with bloodwork (T4 +/- free T4 are the specific tests we run).
Some of the signs we can see in cats with this condition include (not all cats will have all the signs):
Treating hyperthyroidism is also very easy and straightforward. I strongly recommend using a transdermal form of the medication (it is applied to the inner surface of the ear
). Oral forms are often not tolerated as they can nausea and vomiting. The transdermal form is super easy to use and very effective.
If it is determined that Boots has hyperthyroidism, treatment is usually effective at eliminating the symptoms (such as the excessive meowing) that you are seeing.
Here is a website with some additional information on this illness:
I hope this helps, please let me know if I can answer any other questions.