Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to start walking your puppy [title] Choose a collar. [step] Look for an adjustable nylon or leather collar. The exact collar you choose will depend on what type of dog you have.

Ending1: The collar should not be too tight or too loose. See if you can fit two fingers between the collar and your puppy's neck-if you can't, the collar is too tight. Ending2: [substeps] You should find a collar that is firm and won't increase your puppy's anxiety about going. If your puppy is used to walking (and they have a strong sense of smell), a regular collar or a padded fit is best. Ending3: If you have a dog who likes to stand or to sit and howl, then a short-length collar is a good option. If the dog has either a longer collar or is reluctant to sit it may be better to go for a longer collar. Ending4: Just do some research on different collars, and you should come up with a collar that fits snugly about the dog's neck. It shouldn't constrict the dog's neck if it might bruise.

Answer format: ending1/ending2/ending3/ending4