Maybe they're having a little doggy argument or playing around. Leashes can sometimes restrict their movement and make them more reactive.
The dogs might be barking at each other on leash because one dog invaded the other's space, or they could be competing for attention. It's hard to say for sure without more context.
It could be that they saw something that got them excited and started barking. Or perhaps they're trying to get attention. It's hard to say for sure without more context.
Maybe they're having a little dispute or playing. Could be part of a funny scene in the show.
Maybe the dog is excited or sees something interesting and is trying to communicate that through barking while being on the leash.
Maybe they saw something scary or strange that made them bark.
Maybe they saw something that scared them in the cartoon scene.
Maybe there's something scary or new over there that's making them bark.
Maybe they saw something that scared them. Or they could just be playing and having fun.
Maybe your dogs are just being curious or maybe they think the cartoon feet look like a threat. It's hard to say for sure!
Maybe they saw something strange or were just having a playful moment.
It could be that the marine dog is barking to establish dominance over the big army dog. Or maybe it's responding to a noise or stimulus that we can't see in the cartoon. Sometimes dogs bark for no obvious reason, and in this case, it could just be its nature or a random moment of excitement while being on the leash.