juvenile | 4–6 months

Your puppy will gain energy and become mouthier and more restless from the discomfort of teething as the baby teeth begin to fall out and the adult teeth erupt. This typically will occur from 4–6 months of age but sometimes lasts longer.

Your puppy also will begin to acquire an adult coat, attain most of her height and become sexually mature.

2nd fear-impact period | Starting in the 5th month as a juvenile, your puppy may experience a 2nd fear-impact period lasting 3 weeks. This is similar to the initial fear-impact period. If it doesn’t occur at this time, it’ll occur later during adolescence.