
If a cat's tail fur looks sticky and waxy, it could be due to stud tail disease, also known as feline tail seborrhea, a seborrheic disorder. Cats with this condition will have an oily, sticky tail.
A cat's tail will produce a waxy discharge, causing the fur to clump together and potentially leading to hair loss. This condition is more common in unneutered male cats, but female cats and neutered male cats can also develop it.