I would keep them separate. You were just asking less than a week ago about getting Hector to unball, something they do when scared and not comfortable. Since you haven't had him very long and he isn't settled in with everything yet, introducing him to any other pets would stress him out unnecessarily and make settling in take longer. It could actually set back any progress you've made.
Some people have successfully introduced hedgies and dogs, however they've always been older laid back dogs--not easily excitable puppies. Most of the time, after the initial introduction, the dogs ran away and wanted nothing more to do with the hedgie. There are only one or two out of the bunch that don't mind having the hedgie lay on them and hang out with them--they were the exceptions, not the rules. In most cases, neither gets anything out of the deal.
The dog seems so eager to meet. That could mean that there would likely be a lot of rough-housing in mind. Introducing at this point, if at all, just isn't a good idea.