My kitty had those. :( He never hissed at anything in his life, except the vet tech who straight cath'ed him to empty his poor bladder.

Also, he was in so much pain he got into the crawl space of the attic and when I went in to get him out, upon having love heaped upon him by me, he relaxed enough to empty his bladder. In my lap. I was both touched and so grossed out.