I had to put my 9 year old cat down yesterday, his red blood cell count was 6% and he was panting and starting to lose control of his muscles. The vet said it was most likely a chronic condition because his body had adjusted to the extremely low blood cell count until yesterday. If it was an acute condition he would not be functioning like he was. My dad revealed that he had given him half an advil 2 weeks ago but he threw up afterwards. Could the ibuprofin have decreased his rbc count to 6% in just 2 weeks without symptoms?