Cupid does not seem very sensitive to tack changes - which overall is good but does cause some challenges for me because it keeps me guessing. I tried several bits when I first got him, but he was equally green with bad steering but amenable personality no matter what so I settled on a nice Myler Comfort Snaffle. I've kept that as his "jumping" bit, and for trails. But I think about 2 years ago I started riding him in a Herm Sprenger loose ring w/ lozenge for dressage. Mainly just because it is a more typical "dressage-y" bit and he doesn't seem to care. But lately he's been a little more nose in the air and just a bit busier in his mouth. His teeth got done a few weeks ago - I will have the vet take a quick look next time he's out just in case, but he is eating fine. But Cupid has seemed a little happier with the Comfort Snaffle so I'm primarily using that for now.