Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to train big dogs [title] Start early. [step] Although this may not always be an option, starting the dog training process when your dog is less than 1 year old is ideal, especially when it comes to large dogs. Plan to begin training your dog as soon as you bring it home, which may be as early as 8 weeks.

Ending1: This will give the dog time to get used to the surrounding environment and to associate being outdoors with meals and exercise. [title] Start early enough to train your dog. Ending2: [substeps] Early training gives your dog the energy to start training. Each puppy should start out near age one and mature well within the first six weeks. Ending3: [substeps] If you're training a puppy, keep the sessions short and integrate play into them to keep your puppy engaged. When training an older dog, expect the process to take a bit longer, and require a little more patience. Ending4: Training is easier if a dog is less than 17 weeks old. This may be especially important if you have young children in the house and your dog is not used to being on its own.

Answer format: ending1/ending2/ending3/ending4