A lot of caramel is vegan, but some is not.
The simplest, pure caramel is made only by heating sugars.
But a lot of products use caramel, or a caramel sauce that also contains dairy (most often milk and cream).
The tricky part is that a lot of products that list “caramel” in the ingredients don’t specify if it contains dairy or not.
Given the prevalence of the form of caramel with dairy in it, it’s not safe to assume that any caramel is vegan.
Unless they explicitly state the ingredients, I’d assume otherwise. If it’s something you really want to have, contact the manufacturer and ask them directly, as they’re the only ones who can tell you if their caramel is vegan.