just lately I have noticed that when I am grooming my male neutered cat, 5- 10 large drops of this nasty brown liquid are on his hindquarters, not in a spray but a couple of large droplets . He has never had a spray problem and is 8 yrs old. I also noticed a few drops on the floor that dried and took ALOT of work to clean them up. Has a unusual & nasty odor, so I am guessing it s like marking spray, but why during grooming which he enjoys?