Chase Toler walked with his family through Jack London Square on Saturday under a clear blue sky and through a crowd of wagging tails and soft paws For his mother, Colleen Toler, it’s quite the sight. Despite there being loud music, lots of people and barking dogs, Chase, 15, is walking with confidence — something she once thought she’d never get to see. Typically, Chase finds crowds like this unsettling. “Chase becomes very overwhelmed, especially out in public,” Colleen said….