Watching your dog grow has got to be the greatest feeling. From watching her first time up and down stairs. To first time being fully poopy trained. First time on a leash and first time running off the leash. 
The joy you get from watching your best friend become an fun loving caring adult has been my greatest joy in life. My dog winter has been there through the hard and the not so hard. She say literally on me after my surgeries, tried to clean my wounds. Laid beside me When I was napping So I had a pillow. She's a joy and my best friend 