Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose collie eye in shelties [title] Test your dog's eyesight. [step] If you want to know if your sheltie has cea, then test his eyesight. In mild cases, your dog may be able to see well enough to cope.

Ending1: But in severe cases, condition your dog and test his eyesight. Common symptoms a dog has and is regularly exhibiting are : [substeps] White eyes in older dogs enlargement when taken by calipers eye discharge swelling pupils [title] Listen to your dog. Ending2: On the other hand, in serious cases, it can be possible to diagnose retinal cancer. [substeps] Take your dog to see a vet if you suspect this. Ending3: However, if it is difficult for your dog to recognize objects that he can't easily see, then he might have cea. [substeps] This is another risk factor for german shepherds, as them are tall and tend to have cloudy vision. Ending4: In severe cases, your dog may be blind. [substeps] Place objects in your dog's path and see if he avoids them or bumps into the obstruction.

Answer format: ending1/ending2/ending3/ending4