So Chevy (almost 4 months) is walking pretty well on the leash. We walk once or twice per day around the neighborhood. The only thing that drives me crazy is his thing about chasing cars. As soon as he hears a car his ears perk up and when the car drives past us, he lunges at it and tries to chase it! I have a martingale collar so I give a little tug when he's trying to "get" the car but it's like his only focus is on that car (and ripping my arm out of socket in the process!). He does this with people on bikes too so I'm thinking it's something to do with moving wheels in general (pays no mind to parked cars). Any tips would be so appreciated!