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Hi. My name is***** I'm sorry to hear about this situation with Duchess. Despite the seeming shrinking of her tail, is she still eating well? Does she seem lighter (losing weight)? Is she still able to move it normally?
She's eating well, she seems to be light weight than usual, and despite some wobbling here and there she's able to move around quite frequently. She's very active for her age.
Thank you for answering those questions. Physically a tail can't get shorter as far as length unless it is injured in a way or surgically shortened. As far as the physical size of the tail, if a cat is losing weight, they can lose the fat at the base of the tail and it can make it look smaller. They can sometimes have thinning of the fur which can make it look less full. It is good that she's eating well. With her age, if she is losing weight, the best thing to do is to have your vet run some blood work on her to screen her for hyperthyroidism, diabetes and early renal insufficiency. These things if found earlier can be managed better.