HI. My mom has a 5 yr old male who about a year ago got a bad case of diarehha and has never gone away. A couple months ago he refused to use the litter box to poop in. Stool samples have been taken into the vet, blood work- nothing. so hoping it was behavioral, i brought him to my home and he was ok for a week. then he started to not use the box and he urinated all over EVERY throw blanket and rug. HE DRINKS LOTS OF WATER - LOTS- AN ABNORMAL AMOUNT and i noticed some blood in on of the dirarehhas outside of the box. we're running out of options. PLEASE HELP IF YOU HAVE ANY IDEA WHAT THE PROBLEM CAN BE! thank you!