Most dogs have some annoying habits. We humans want them to stop as quickly as possible.
Some humans have a little handheld tool they use to stop behaviours they don’t like: a squirt bottle. A sharp spray of water in the dog’s face should stop jumping/chewing/nipping/barking pretty efficiently, right? Plus the gadget is cheap, easy to get and shouldn’t really hurt the dog, right? Well, not in my opinion.