The following five reasons may be why a dog mounts its owner:

1. Playing with the owner: Dogs will have this behavior when playing with their own kind when they are puppies, pretending to hunt companions, When there are no companions around, the master becomes a companion.

2. Declaration of sovereignty: This behavior of the dog also shows you that its status is higher than that of its owner.

3. Attract the owner's attention: When the dog rides on the owner, it means that the owner wants to play with the owner. The owner needs to observe whether the dog is too lonely and needs to play with the dog.

4. Possessiveness: Dogs are very possessive of items. If a dog mounts its owner, it wants the owner to get its scent.

5. In heat: It may be that the dog is really in heat, and there is no dog of the opposite sex around, so it rides on its owner.