Grandmother taking her dog to playgroup?

hey ladies theres a playgroup up the road to me that i dont go to very often i hate them lol but my son loves it so i try and force myself to go every so often for him. well today i went and an old lady who had brought her granddaughter had also brought her dog! i found this really odd! what do you think? i dont think its fair on the dog (a little ugly thing lol) with kids patting him and chasing him! also what if some ones child was scared or allergic to the dog? i just find it really strange!