A. If he is whining continuously then there is a source of pain or discomfort, or possibly age related disorientation, which requires treatment by your nearest vet. Mucus stools can be an indication of colitis or inflammation of the lower bowel and can be an uncomfortable condition. Other causes would include parasites. If the blindness is sudden this should also be investigated as it can be due to diabetes, painful eye conditions such as glaucoma or neurological conditions
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