The only concern I have is Tank isn't neutered.... ?!? Any input ? We did doggy park once but then he tried mounting all his new friends. I noticed all the other males were neutered so we left as to not offend anyone :/.
I have no experience with this but I do know that Dublin would probable "freak out" She is such a submissive girl and has not had any experience with this. I'm sure the others in the group can comment though