3 months old puppy from yesterday his eyes are a bit redish and from yesterday afternoon his food intake has reduced ....He is active but looks a bit tried ....what should be given to him ....

It could be conjunctivitis. You can put one drop of Gentamicin drops 4 to 5 times a day to both the eyes. If symptom persists or if you are finding any other symptom, you need to consult a veterinarian.