That is what I am worried about the most.
I want to avoid aggressive barking from both sides of the fence.
Luckily their dog kennel is on the other side of their house.
It is only when he has free run of the yard he comes close to our fence.
There is a guy a our local tack and feed store that told me I could give them my puppy's blankets for their dog to smell after he has slept on them until their dog seems uninterested.and getting him familiar with my puppy's scent before they see each other through the fence.
I am going to try this and we will see how he reacts to the new smell without exposing my puppy to any aggressive behavior.