My cat started to pee all over, especially on clothes. One day, he attempted to pee infront of me and could not express his urine. A call to the vet, made for hysterical ride to the vets (and now the herp part comes in), I immediately put my adult female ball python up for sale, so I could afford vet bills and was actually fielding calls in the vet's office regarding inquiries on my ball python!!
They found that my cat has urinary crytals which unfortunately are a reoccuring problem, but no blockages in a year and half!
The crystals cause pain while peeing and thus the cat associates the litter box with pain and no longer uses it.