Looks like this issue is coming to a boil. No doubt service dogs are needed by some. Those that need them need to make reasonable choices... small animals are less of a problem than big ones on public transportation. Your rights to do anything end where they unreasonably interfere with mine. Many service animals are well behaved... some are not. Some service dogs are for real.... some are just the family pet with papers to avoid flying with cargo. We probably all know someone doing this. Since this is being abused we need more guidelines... pet size limits, only allow animals in designated seats / sections that are highlighted for everyone during booking, and require special fees for pets... up to and including paying for a seat for them if they otherwise would impact someone sitting next to you. This has to be fair to everyone.