Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to soothe a dog's itchy ears [title] Know when to see a veterinarian. [step] If you've noticed your dog constantly scratching his ears, get him examined. The vet will use a tool (otoscope) to examine deep inside the ear canal and check if the eardrum (tympanum) is intact.

Ending1: If it is not, then make an appointment with your vet. [substeps] Before taking your dog out for walks around the neighborhood, do some research. Ending2: If it is, then the vet may suggest saline to help soothe his ear canal, since you'll also need an otoscope and binoculars. [substeps] Another possible cause of scratching your dog's ears is ear infection. Ending3: The vet may also use chemicals (papyrus, mineral oil, panacur, or dolomide) to treat the ear canal. [title] Use an otoscope to inspect your dog's eyes. Ending4: The vet will also look for other causes of itchy ears. For example, the vet may swab your dog's ears to diagnose an infection.

Answer format: ending1/ending2/ending3/ending4