Personally, I wouldn't use them if they spray anything anywhere on the property.
Most likely they would be spraying insecticide, as in kills bugs ie springtails, isopods, fruit flys, etc. Even if they didn't directly spray the rhodos, I was a licensed pesticide applicator for a few years, over-spray and wind drift happen.
Amphibians are also very susceptible to many pollutants/poisons even at levels that would be safe for other types of vertebrate animals. I'd even be worried about herbicides like glyphosate (roundup) which is relatively inert to people and mammal type pets.
Bottom line, if there has been any spraying, is it really worth your pets lives to save a few bucks on leaves?