Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to prevent arthritis in dogs [title] Learn how much to feed your dog. [step] Dogs that are overweight are at a higher risk of developing arthritis. Carrying extra body weight will place extra stress on the joints and bones of your dog, possibly resulting in arthritis.

Ending1: The ideal amount of exercise for dogs is 30 minutes per week, while more vigorous or strenuous exercise demands much more. [substeps] If your dog is overweight but not overly heavy, taking your dog to the vet and getting a few hours of exercise is usually safe for your dog. Ending2: Make sure your dog is getting adequate daily amounts of food for its weight and body type. [title] Limit the amount of food you feed your dog. Ending3: Feeding your dog sufficient calories is important because dogs weigh 12lbs or more. Your dog's weight will increase with age, along with diet. Ending4: Make sure you are feeding your dog a healthy amount of food and that its appropriate weight is maintained. [substeps] The amount of food that you feed your dog will be based on its size and activity levels.

Answer format: ending1/ending2/ending3/ending4