Actually when we first purchased into the membership, we were, adamantly, told that there are no pets permitted. When we informed them about allergies, they mentioned about the service animals. We then inquired about what we should do to ensure we don't receive a room after them. We were told that service dogs were kept, in most cases, on the first floor. They were quite sure about that and I had no reason not to believe them. This was over 15yrs ago.
However, in the beginning of our membership when I called to book it, I did speak with the CMs about this and I was told, each time, that there is no need to worry and I did not need to make this request. I was told, again, that they are usually assigned a lower floor and just to ask for higher floor. And, this time, they mentioned that there are very few guests who come with service animals that it should not be an issue for us. They also said that if we had allergy issues, we should contact the front desk and explain.
Although I will admit I was quite naive at that point and believed them, it's been 15+yrs and many many stays, with only one stay on the ground floor, and we've had no issues with pet allergies so far. Were we just lucky? Not sure, but adding the possibility of more pets in the rooms will likely have different consequences.