Vaseline is like a gooey jelly that can help your dog's dry skin, but it's not the best thing for them all the time.
If your dog licks too much Vaseline, it might get a tummy ache, and it can trap dirt and make their skin itchy.
If your dog has a boo-boo or really dry skin, it's better to ask the vet what to use.
There are special creams and balms made just for furry friends that are better for their skin.