Yes, guide dogs, hearing dogs and registered assistance dogs are all welcome in the park.
As soon as you enter the park head to the Resort Box Office for your Ride Access Pass (documentation required).
Whilst assistance/guide dogs are welcome in the Theme Park they will not be able to accompany guests onto any of the rides. They will be allowed as far as the loading point where they must be left with a member of your party – they must never be left unattended anywhere in the Theme Park.