But the best and biggest change for Roo has been having a family who loves him, cuddles him and cares for him unconditionally - without getting frustrated at his health problems.
Sarah and Kelly still have plenty of plans for Roo. They're going to take him on a doggie cruise, and let him experience as much fun stuff as they can for as long as they have with him.
For his new forever family, loving Roo has become a lesson in valuing every day. "Though Roosevelt has only a few months to live, we hope that he inspires everyone to #LiveLikeRoo now and forever," his moms posted on his Facebook page.
Caring for a dog like Roo, who only has a short time left, can be heartbreaking. But, as Sarah and Kelly are finding, it can also be so, so beautiful.
Roo is getting the chance to do everything he missed out on, and in thanks, he's showering his new moms with all the love his little heart can give. Maybe we should all try a little harder to #LiveLikeRoo.