[FryFry]

Leo has started to bark at other dogs, and sometimes people whenever he's outside or on a walk. He even did it today in the car, because there was someone next to us fixing their car. He just turned 5 months old today, and the barking started about 2 weeks ago. I don't understand, because whenever I or another family member had him outside we always allowed other people to pet him, and he was allowed to sniff other dogs. Today, while he was on a walk, there was an old dog walking past us, and Leo stood there and got really stiff, then started to bark. Normally if I, or whoever's walking him says "No" and jerks on the leash he'll stop, but today he wouldn't stop. Oh, jeez, do I have another barker on my hands? Zoey barks at other dogs in my neighborhood, but once she's out of the neighborhood she's a "princess". Leo barks at other dogs, and people no matter where he's at. His first day of puppy classes he barked at the 6 month old Min Pin in the class. How do I correct this behavior before it gets worse? Will the puppy classes help out with that? BTW, he's still bullying Zoey..He's been doing this since the day I brought him home. Poor Zoey is hesitant to walk around the house because he'll just come out of nowhere and bite at her. Now he's started to bite at her neck, and pull on it. He'll also bite at her hind legs. Zoey will yip, and whine when Leo does this but 9/10 times Leo will continue. Could Leo be aggressive? =(