River's trainer recommended either the Puppia harness or the Blue 9 Balance harness. Each is very different in design. Puppia - we used on last dog - worked very well but I don't think the Balance design was available back then. Balance is considerably more expensive but flexible fit and top rating has us considering it. Comments? Suggestions? Would love to hear from those familiar with the Balance harness - is it worth the extra money? We have to get one asap. River does well with loose leash walking except when she is overtired then she gets crazy and pulls and yanks herself and we're concerned she could accidentally injure her neck. Thanks!