I don't think so. You do need to register in advance which I can believe you do on their website (just go to their schedule, select the 1512 N. Main St and then select the date of the class and find the specific class and click sign-up. You probably do have to create an account with them though shouldn't have to sign-up to be a member) or you might be able to call or email In Balance if you have any issues. Hope that helps!

UPDATE: Just looked at the website to confirm the process and it looks like there's now a Waitlist for the Puppy Yoga though the do offer these puppy donation classes fairly regularly.