Hi everyone, I'm going to be walking a neighbour's dog a couple of mornings each week. He's a little Chihuahua and is quite reactive on leash, barking like a little nutball at other dogs and people who try to greet him. He doesn't snarl or growl - he just seems overstimulated and undersocialised/under-trained. He also pulls on the leash and isn't responsive to his owner (which isn't surprising since he seems so overstimulated in public). I've only met him once, and he barked when I first went to greet him, but he quickly became calm and just went about his business. He accepted fuss from me later, when his owner was holding him. Otherwise, he was too cautious to come to me, so I will need to build trust with him. I'm wondering how best to approach this situation. I want to be able to bond with him and make his walks fun and engaging. I'm thinking that the more he sees me as something interesting, the less he'll be bothered by what's going on around him. I've had a reactive dog myself in the past, but because I lived with him, bonding and training was easy. I won't be able to spend time with my neighbour's dog outside of walks. His owner has also asked me not to give him treats, as he's overweight. I also won't be able to use a long line for games either, as we live in a city and the park I'll be taking him to is very small. If any of you have any ideas or suggestions, I'd really appreciate your help!