Yes so they have some obediance
A dog trainer is very useful in training a dog that hasn't been puppy trained yet. The trainer will teach the dogs tricks as well if you so desire. However, the most important part of training a dog is to potty train.
At times these can be useful, like when training your dog not to bark when you are not at home to correct the behavior. However, I would train the dog using positive reinforcement before you try negative reinforcement. This means that you reward a dog when they do something correct with a treat and/or praise. When your dog does something bad you tell it no sternly. Depending on the severity you can put the dog in a "time out" in his crate, so they learn the lesson. Labradors are very smart though, and are food motivated. They should be easy to train using positive reinforcement.
nothing is useful
If it is a guard dog it guards property, that is useful.
If you buy a dog house, the dog will not use it until you train it to go in the dog house.
It is not recommended to train a dog to pee indoors as it can lead to behavioral issues and confusion. It is best to train your dog to go outside to do their business.
no
The duration of How to Train a Dog is 480.0 seconds.
How to Train a Dog - 1936 was released on: USA: 1 July 1936
One can train a dog to use the toilet by following one of several different methods. Some ways that one can train a dog to use the toilet are: taking them to a dog trainer, utilizing dog training books, or watching dog training videos on YouTube.
train it
Useful is not a noun or a verb, it is an adjective. Adjectives are descriptive words used to describe nouns. For example, if you say, "the useful dog," useful is the adjective modifying dog, the noun.