It is an invitation to discretion, to be faithful and prudent with your words. Though dreaming of a padlock can also highlight confinement or isolation.
Gallery of dreams
Do animals dream?
Research conducted by various scientists show that animals do experience dream while sleeping. They also experience similar sleep stages like human beings - REM and Non-REM. If you have noticed a dog sleep, it might sometimes wag its tail, this indicates some response to its dream. A study was conducted in a cat by removing a part of the brain stem, which will not prevent it from reacting to the dream during REM. It was noted in some cats they were aggressively chasing mice as in reality.
Have you ever remembered your last dream? Were they colorful? Yes. Most of the dreams will be colorful as experienced in reality. Very few people visualize dreams in black and white. A study was conducted where the individual was given a color chart and asked to match colors that they dreamt. Most of them chose light colors while very few choose only black and white. It was very clear from this study that most of them have colorful dreams.