It is not recommended to put contacts in after using sulfacetamide. The recommendation is to wait at least a full 15 minutes before putting contacts into the eyes after using sulfacetamide.

Can sulfacetamide sodium opthalmic solution be used in ear

I used many antibiotics for several years that failed to help with stye. After Sulfacetamide sodium ophthalmic solution, there was never a recurrance.

If the scratch in the eye is beginning to get a bacterial infection inside of it, then yes, Sulfacetamide Sodium Ophthalmic drops will work.

The warning label clearly states "Keep away from eyes." I would think this applies to dog eyes as well.