shihtzu problems

Hi, My dog has recently came up with some bright red irritated skin. In some places like his armpit, mouth, belly and legs there are yellowish scabs. He is itching nonstop and this has been going on for about a week and some change. Any ideas on what it could be? Or what I can do to relieve some...

Seriously. It's not anxiety being in the car. It's anxiety every time we drive by a bunch of trees or any body of water because he thinks it's a park and gets excited. Then when we keep driving past what he perceives as a park, he gets into an anxiety attack panting, barking, going in circles...