Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose canine eye infections [title] Regularly inspect your dog's eyes. [step] While we may take the time to check our dog's body for changes while we brush or groom it, its important to look in its eyes for changes as well. Pay attention to any redness or puffiness and keep an eye on these changes to make sure they go away quickly.

Ending1: These changes will need to be checked periodically and will not always occur for several weeks or months. Things to look for include : [substeps] Crusting of skin [title] Determine if your dog will require surgery. Ending2: Seek medical attention immediately if you see these changes. [substeps] Wash your hands when touching or playing with your dog. Ending3: [substeps] Just like humans, dogs can have allergic reactions to things in the environment. Just because a dog's eyes are red doesn't mean it has an eye infection. Ending4: Remember not to reach into the eye or apply lubricant or antibiotic cream. If necessary, seek medical attention to encourage them to get treated.

Answer format: ending1/ending2/ending3/ending4