I'll just get an electric fence to contain the dog. Most labradors are hyper,, some even VERY hyper. They have more energy than you could imagine. Field bred dogs tend to be more hyper than show type dogs, but again, even this isn't always true. Actually, I noticed a major change in my 2 older dogs when they each reached between the ages of 2 and 4.
Labs are notoriously destructive if left to their own devices, because of excess energy.
This can continue up until 8 years of age in some of them. Labradors are so behaved. Again, this is a major misconception. Labradors are NOT naturally well behaved. They MUST be trained to behave, and because they are usually so hyper, a lot of training.