Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to care for a saint bernard [title] Start training early. [step] Saint bernards are intelligent and eager to please, but they can also be stubborn and immature. Their massive size means that bad behaviors like jumping on people can have serious consequences, so it's important to start training while your saint is a manageably sized and pliable puppy.

Ending1: [substeps] Begin training at six-to seven-year olds and ultimately, up to eight-year-olds. Ask your veterinarian if it is safe to do so until your dog reaches those ages. Ending2: [substeps] Begin training your saint about 10 to 15 weeks before your dog's birthday. This will allow you time to train him properly and make it easier to train. Ending3: [substeps] You should also start socializing at a very young age. Take your new pup to the dog park and introduce it to all your friends and family in order to make them easygoing and friendly. Ending4: [substeps] It's best to begin training at four or five years old. As the older one, place your saint somewhere near a training area where you and a family and friends will have time to spend together, such as your living room.

Answer format: ending1/ending2/ending3/ending4