Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to teach your dog to howl [title] Wait for the dog to howl on its own. [step] It's tricky to make your dog howl before you've trained it. So, the first step is just waiting for the dog to howl.

Ending1: Ideally, wait on the dog and let it howl on its own if it feels comfortable enough to do so. [substeps] If you start to see changes in your dog's behavior, stop and wait for it to start howling. Ending2: A well trained dog will howl without noise for hours and possibly even days. However, when training it to howl, sit quietly until it is quiet. Ending3: Once the dog starts howling, the rest of the training process is over. [substeps] Some dogs howl randomly when they're not playing, while others howl through the whole house. Ending4: It may be inclined to howl if other nearby dogs start barking and howling, or if it hears a certain high-pitched sound like a fire-engine drive by. [substeps] Try taking your dog to a dog park if it's not inclined to howl.

Answer format: ending1/ending2/ending3/ending4