Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to treat eye problems in boston terriers [title] Watch for signs of a corneal ulcer. [step] Your dog's eye may water a lot to the point that it looks like he's crying. The eye can look red and you might see a layer of film over your dog's eye.

Ending1: These can all be signs of a corneal ulcer. [substeps] A corneal ulcer is like a burst blister on the surface of the clear part of the eye (the cornea). Ending2: This film should come off with the dog. [substeps] If you notice your dog acting up or not getting attention when running or jumping, it may be a sign of a corneal ulcer. Ending3: Tear ducts can also become clogged with a buildup of blood, which can result in a corneal ulcer. Goiter is the process of pus oozing, which requires to be removed by a vet. Ending4: This takes a lot of time, so make sure to watch your dog for any doctor suggested by your vet. Watch for any unsanitary changes : [substeps] Head tilt over the eyes moving from side to side or side you then look up at your dog's muzzles.

Answer format: ending1/ending2/ending3/ending4