The dog barking on leash in a cartoon could be part of a comical scene or to draw attention to a particular event. Sometimes, it's just a random element added for entertainment value.
Maybe the dog is excited or sees something interesting and is trying to communicate that through barking while being on the leash.
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.
The little dog on leash might be barking at the big dog because it's excited and wants to play but doesn't know how to communicate properly. Maybe the big dog did something that the little dog didn't like, like getting too close to its space.
Maybe it saw something that made it feel threatened or excited.
Maybe it saw something that made it excited or scared.
It could be barking to protect its territory or to get attention. Sometimes dogs bark just because they're excited or trying to communicate something.
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 they're having a little doggy argument or playing around. Leashes can sometimes restrict their movement and make them more reactive.
Maybe the dog is excited about going on a trip or is trying to get the attention of its owner.
Maybe the dog is excited or scared by something in the car.