Flying free with my ball

More: We adopted Molly 1 yr ago in December 2019 and we are her 4th (and final) owners. She supposedly spent most of her puppy hood in a crate 12-14 hours a day (owner #2). We don’t know anything about owner #1. Owner #3 was our cousin who became very ill after rescuing Molly, so she came to us. She’s the sweetest dog in the house or when chasing a ball or disc but reactive on leash. She and our 14 year old rescued corgi, Niko, get along fine.