Interestingly, you observed this, and it seems like there is a discrepancy between what the hikers are saying and what the Rangers are saying. The hikers may not be aware of the regulations and misunderstand what they hear from the Rangers. It is also possible that the Rangers are not enforcing the regulations as strictly as they could be. If you are concerned about this issue, I recommend registering your dog on
www.servicedogregistration.org and getting all the documents that your dog is a service one.
