I use clicker training with my two and this would be useful to teach them any desirable behaviour to replace a non desirable one. Sitting calmly instead of jumping about demanding things for example...Obviously, they get a treat or other reward after every click they hear and the click must happen when the dog is doing what you want.

Another thing. Jealousy does not apply to any creature other than humans. Dogs get possessive and protecting of resources...they don't get jealous. There is a difference.