Puppies grow into calmer adult dogs if they're exposed to noises, people of all ages and other dogs while they are still young. In a good kindergarten class, the dogs have supervised play with other puppies that match up well for their size and temperament.

What age is a puppy worse behaved?

Approximately 35% of owners and trainers voted 8-9 months as the toughest age citing new challenging behaviors associated with their puppy's now larger size such as pulling on the leash or counter-surfing.

Why is my puppy so badly behaved?

Besides stealing and playing keep-away, common puppy behavior problems include lack of house-training, hyperactivity, nipping, chewing, eating feces and getting sick in the car. Lack of house-training usually stems from giving the puppy too much freedom too quickly. ... Hyperactivity is probably just part of being a puppy.