Some dogs don't mind sharing attention ... and some dogs, not so much. But do dogs actually have the ability to feel jealousy, or its cousin envy? Read more about some studies that look to answer that question at the link.
C.S Lewis. If you have to ride on someone else's motivation until your own can carry you forward; "Do what you must until your past is so far behind you, the future is ALL you can see". "It's so much brighter then you've ever been told". This I promise!