I thought that in Australia only all sheep were gay. Not that the poor creatures have much of a choice really ...
That said, I fail to comprehend why a single gay dog should prove more burdensome to the restaurant than a single straight one. While copulating dogs of either both sexes or just one might not be to everyone's, errrm, taste who eats there, sexual leanings that remain unpracticed in the public eye should not be that offensive, dog or no dog, blind or seeing.
Unless the dog listened to Barbara Streisand a lot that is.