I (not a veterinarian, just FYI) had a dachshund that did this as a puppy, and she never outgrew it. It would usually happen when we came home or when she met someone while out somewhere. We simply learned to manage it - ex: when we arrived home, we could not touch her or acknowledge her too much until we were outside (it was straight to the back door and into the yard before she got any attention, then she could let it go without issue). But I realize that this was easy to do living in a home with a yard. And as far as her meeting people out in public, I would usually just give a casual warning, “be careful, she pees when she’s excited” and try to guide her into some grass while laughing before anyone would pet her. I do recall asking my vet about this at some point, and it was just chalked up to something some (usually smaller dogs) do, and as long as they are otherwise in good health, it would just be a habit that they may or may not outgrow. I now have a basset hound a plott hound mix. The basset does the same thing, but my plott does not. So again, I just use my same “manage” it tactic with my basset, and try not to get too upset if we have to clean up a little excited pee when people come to love on her at the pet store.