Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to teach a dog rear leg awareness for agility [title] If you haven't already, try gathering information from books, the internet and other agility dog owners about training techniques. [step] There are many videos on youtube specific to certain exercises and tricks. [title] Enroll in an agility class.

Ending1: [step] Look around and see if there are mounting and acrobatics classes. If none of these are available, consider having you pup trained at a gym or recreation center. Ending2: [step] Although these can be quite pricey, you can always take the basic beginner lessons to learn and ask any questions you have about the sport. This is fundamental to your own learning as it isn't just your pooch pal who has to try new things. Ending3: [step] This can be a very fun experience for all individuals. [title] Make sure that your dog has proper manners and equipment before the class. Ending4: [step] It is important you put into training a dog if it doesn't already understand this basic skill. [title] Teach your dog to sit and stay.

Answer format: ending1/ending2/ending3/ending4