That’s a really anthropocentric reading of the dog’s reaction, as if the dog is reacting to it as a rival dog because it somehow resembles a dog to us. I’ve seen the same kind of reaction from dogs to vacuum cleaners, cats, cars, dishwashers, children-virtually any fucking thing that stimulates a dog’s curiosity/challenge/self-preservation response.
A dog’s overwhelming take on something is literally a smell test. If it don’t smell like a dog, it definetly ain’t a dog.