Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to stop a dog from pulling on its leash [title] Use a proper collar. [step] Be sure that your dog has a comfortable collar that fits it properly. The collar shouldn't be so tight that it is choking the dog, but should be tight enough so that it does not slide up and down the dog's neck.

Ending1: [title] Give the dog a chance to remove the collar. [step] Direct your dog to repeat the same steps until the dog has removed the collar completely. Ending2: If it is too tight, the dog can bite you. If it is too loose, the dog could easily suck on your fur or pull you toward its mouth. Ending3: [substeps] The collar shouldn't be so tight that the dog's face can be seen, but it should not be so tight that the dog cannot breathe. Consider wearing a real life collar or a regular collar. Ending4: [substeps] You should be able to slide your hand between the dog's neck and collar when it is secured in place. Many people choose to use a harness instead of a collar.

Answer format: ending1/ending2/ending3/ending4