Is this the terrible teens?

[CoolStoryBro]

Help! Somebody appears to have swapped my beautifully trained 14 month old (male, neutered) dog with a total pita!

He's lunging at cars, pulling on the leash, barking at wheelie bins and annoying the crap out of his hitherto top dog, older "brother". What's happened to him?!! Will he grow out of it or are we right back at the start and need to train him alllll over again.

Serves me right for being so smug in puppy classes really
Any advice?!

I should add, that my previous 2 dogs didn't go through this so it's come as a bit of a surprise!

you have been lucky with your other two. Make sure you are walking the pup alone, enforcing your training and keeping it fun. It is the terrible teens.

Definitely terrible teens!
Just make sure you keep on top of his training till he comes out the other side.