Urinary tract, all the way back to the kidneys, the blood in what little urine coming out was a giveaway. They offered special diets and so forth but when the kidneys are going it's best to make sure the animal suffers no more for I'll never let an animal suffer just to prolong the pleasure of a human, no mater how painful it is.
Only 8 and half, and there's now a 7.5kg hole in my heart that can never be filled but there's 8.5 years of memories never to be forgotten.
RIP Spiko