I have a collar and I've considered buying a leash before but couldn't find one that matched my collar nicely. My fursona is pretty feral and and many mannerisms more akin to an actual wild fox like squeaking or playfully nipping.
Outside of role play, the most I'll do is growl. It would be amazing fun to wear a collar etc but I think I'd just feel to awkward. I'll occasionally greet people with "woof" though. Now in play, that's an entirely different story!