Recently did the monthly Advocate treatment to both our cats, have been using it for over 12 months with no issues. This time the following day it appeared as though some fur had got caught in one cat's collar. On freeing the fur I realised the back of the plastic safety catch had sort of melted and her fur was welded to it, there is also a blister on her skin. Reported to the vets and they had never heard of this happening. Just wondered if anyone else had experienced this issue with Advocate?