Jack Russell scratching eye.

[ElijahMack]

Hello,
I have a 2 year old Jack Russel and for the past little while he has been scratching his right eye as if its itchy. It hasn't been anything more than scratching it once a day or so, but sometimes he scratches it and it starts to bleed. We took him to the vet and they just prescribed Polysporin eye drops which I've been giving him everyday but he still scratches every so often and is missing some hair around his one eye from it. He eats regular Iams dog food that we've been giving to him for a while now and hasn't got sprayed in the eye from anything. By the way this has been happening for a month or so now.