It was very sudden so I'm not sure if it could be cataracts, but for the last week my guinea pig's eye has been very cloudy looking. It's almost like there's a cloudy film over it. He just went to the vet last month because he hasn't been eating his hay and his breathing has sounded weird plus he hasn't been active lately. All he does is lay around. The vet put him on an antibiotic called Sulfamethoxazole Trimethoprin for 10 days. I don't think it made much of a difference but I've been to my vet two different times in the last two months and my vet hasn't been able to figure out what is wrong with him.