Of course, it is best to train dogs when they are young, which is absolutely true, but it doesn't mean that they can't train as adults. Dogs are smart animals. Dogs spend a long time with their owners and are more obedient. Therefore, if the landlord wants to train adult dogs, please do it with your heart and spend more time and energy on teaching. Dogs should be caressed or rewarded if they are right, and not reprimanded or violent if they are wrong.

It is suggested that the landlord can train repeatedly, and the dog will gradually become conscious after a long time.

I hope the above can help you.