Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to train a greyhound [title] Buy a six foot nylon leash and a martingale collar. [step] A greyhound can back out of a standard buckle collar, so you will need to purchase a martingale collar for your new pup. You should never use a metal choke collar as this could damage your greyhound's throat.

Ending1: [substeps] You can find the leash and the martingale collar at your local pet store. A martingale collar is made up of two loops, a large loop that is adjustable and placed around your dog's neck, and a small loop, known as the control loop. Ending2: [substeps] Be sure to consult your local regulations to find out how to purchase a martingale collar. The nftsc is the body department of all animal rescue organizations; the requirements are straight-forward and consistently clear. Ending3: You can purchase a martingale collar at most pet stores. [title] Use a leather halter over a nylon halter collar. Ending4: [substeps] Look for a collar with options that make your collar more comfortable. Some collars may even sit under the teeth.

Answer format: ending1/ending2/ending3/ending4