This wonderful older dog with “dry eye” in the left eye. The treatment philosophies, realities, and some of the decisions that going to a case like this.

Canine and feline diseases of the eye. Diagnosis, treatment and common disorders as well as philosophies in eye disease management.
This wonderful older dog with “dry eye” in the left eye. The treatment philosophies, realities, and some of the decisions that going to a case like this.
This one page document describes corneal ulcers and the differences between that and conjunctivitis, and some of the situations that can surround the corneal ulcer case. And eye that “pops” (phthisis) is the worst end-game and is to be avoided.
https://drjohnson.com/wp-content/uploads/2019/09/Corneal_Ulcers-1.pdf
You can use Similasan for dogs, there are two formulas that work well, one is for Kids, Irritated Eyes, and the other is their old “Allergy Eye” formulation. I use and recommend both of these when I have eye irritation and want to avoid the use of a steroid drop or ointment. It is IMPERATIVE that you see a Vet when your dog has a painful squinty eye or if any redness in the eye goes on very long at all. An ulcer can form in the eye and pop it, blinding the dog in the affected eye.
https://drjohnson.com/wp-content/uploads/2019/09/Similasan-1.pdf