You can not leave a service dog in the hotel room. Or should I say PERIOD. It is against the rules and policies. A service dog is a privilege, the rule is no pet, so a dog who is not doing any service for you hence staying in the room unattended with no one needing it is a pet... DO NOT leave you dog in the room unattended, at least to go to the park, I will to go to the pool for a little bit, but that is because my dog may jump in the water, so I go and check it out first, most of the time I do leave someone in the room if I can, if not I am back in just a few minutes, I have also done it to carry laundry or something since I can't have great control of the dog and a full load of laundry. But those are just a few minutes, not a few hours in the park. Even in a cage, this is against Disney rules and policies, and it would not be covered under ADA if you left your dog in a cage in the room for hours as you go park hopping, many things could happen during those hours, and pets are not allowed in the hotel room.
Okay that said, if the dog sleeps on the bed, for a reason, than I would do it at Disney, ask them to double the mattress cover, or put a plastic mattress cover on if you think you need to. Some dogs do need to be in the bed to do the service, the thing is you want Disney to make sure they have the cleaning right for the next person, incase they have allergies or something.
And the pp who said a dog in the world is hard was not kidding. I am spoiled, in DL we have the kennel right at the gates to both parks. In wdw there is more parks and more travel and more everything. The dog will need some rest. Good news is the kennels are right next to POR so you can put the dog there at least a few hours a day, and no they do not discount it. But it is a fun and safe place for the dog, and I highly recommend it if you are doing more than three days. My dog and I walk 3.7 miles every other day at home, and she works every day, but in dlr last year she was lame and tired after 5 days and went home and didn't move for three days, I was about to take her to the vet when she started to move again. Think of that as you prepare for the trip, is the dog necessary and can your afford the kennel if the dog gets tied.we are going in may for 13 days, the dog will be in the kennel every other day, meaning my family will have to be my guide on 6 days, if she gets tired it may be more. I will have her each night in the park, because I need her more at night.
You could bring a cage, but most service animals use tie downs, all I have meet do anyway. Since mine and I would hope any service animal would not pull on the tie down, I just put it around the bottom of the bed leg and she is fine there. If I tell my service dog no to the bed, she won't get up on it for anything, even in the middle of the night, she sleeps with me at home but when we are away she knows she has to stay on the floor. She was trained to obey and most service animals will. I usually take her bed from home with me, or at least the lambs wool sheet, and her tie down. On the plane it is free to have the medical equipment. So it is free to have the dogs stuff fly.
Sounds like you have never taken the dog on vacation or at least to Disney or the likes, don't forget wax for her paws, or boots. Most service animals are trained in them. My dogs all were, but since it is so hot here mine won't wear the booties for long so we do the wax, then you will have to find a place a few times a day to wash it off and really it, other wise her paws will be very sore and fast in that heat, another reason why I give her every other day off at the kennel, but we do very long trips 13 days.
If your dog loves water, make sure she will not jump in pools, mi e won't but I always have to know what I am getting into first and control her the minute we get close because here she loves to jump in the river and I allow it. Also, I use the kennel for bb and tl since the dog can not get in the water, I won't torture a lab like that, it would be like taking a two year old to a candy or toy store and saying no all day long.
Did I forget anything, hum, hum, hum. No I think I covered most of your questions. Just remember the minute you leave the dog unattended in the room, he is no longer a service animal, he is a pet because he is not there for service and Disney can ask you to leave the property with your pet, because pets are not allowed. I think if you explained that you were checking out the pool or carrying laundry they would say okay, but they will not say okay for a 5 hour trip to the park with the dog unattended in the room even if in cage, if in cage that indicates he is not doing a service. If your grandson needs dog in bed, ask Disney how they want to handle the situation. They may want two mattress covers on or a plastic cover on, they have them for kids who wet if you ask so they will have them. Tell them you have the dog, they do extra cleaning for the privilege of allowing the dog. Use tie down when you can, the dog should be trained with tie down.
Don't take me wrong, this is for everyone not just you. If the dog is not a fully trained service dog, please leave them at home where they will be more comfortable and more relaxed. Disney is not a place for even the best of dogs, it is a lot of walking, on very hot pavement, with lots of distractions and lots of people. Even me who has had a service dog for more than 8 years now, finds it very difficult in Disney, especially wdw with my dog and my new dog I have had for almost two years now and I plan to kennel her some of the days. I don't know you so I am not questioning you per say as if the dog is a true service dog, but I always like to give the warning whenever I can, that if the dog is not a full service dog with very impeccable training, he is much better at home with a family friend than at Disney for your vacation, please don't take offense to that.