Polisporin is like a toothbrush, in that you'll find it in any pharmacy in Quebec. As far as I know it does not go in the eyes - there is an opthalmic fluid that 'can' go in eyes depending on the condition.
But because you are not a vet, you should not be prescribing treatments for your dog. maybe the dog has something that looks like an infection but it's something else. maybe the dog needs something stronger at this point. You should not be trying things yourself - as the dog may well suffer for it.
This is something that should not be too expensive but is something that should 100% be treated by a vet. Good luck!