Hi fellow Arizonian! It's totally up to you whether or not you feed supplements. Supplements can def help support their needs, just as they can help support humans as well. You're already giving some nice ones with the joint support and fatty acid support (although the studies out there show joint support is really controversial as to whether it works). If interested in add'l supps, one company I like is this one for supps:
Natures Farmacy Inc.