keep him on a long line that you can grab.
Set him up and correct him.
Masi would eyeball cars when we would walk on main roads, as a puppy, and sometimes lunge at them, I knew I had to do something just in case.
So everyday we would stand at the end of my driveway, when a car would approach before it even GOT to me,or got a reaction out of her, I'd tell her to leave it..if she even thought about 'lunging', she'd get a correction..
We walk everywhere, cars are everywhere, she doesn't even look at them anymore, of course she's mature now as well.
Work on your recall as well..you have to be more interesting than that car racing by, can be sometimes very hard for a dog/puppy to ignore something much more interesting tho deadly than us..but getting a solid recall will help..
Danger Danger vom Kleinen Hain aka Masi
"Angel" Jakoda's Bewitchen Sami CD OA OAJ OAC NGC OJC RS-O GS-N JS-O TT HIC CGC
"Angel" Steinwald's Four x Four CGC HIC TT
Harmonyhill's Hy Jynx NA NAJ NAC NJC RS-N JS-N HIC
Jakoda's Jagged Edge