Corneal Ulcers in Dogs and Cats
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