popa – you are hilarious!
Is it Kelev Yisroel?
On a somewhat more serious note, why would any Rabbi even try to ban a blind mispallel from coming inside a shul with his service dog? There is surely no halachic issue, (other than the humorous ones proposed by Rav Popa) and these dogs sit quieter and behave better than many mispallelim.
I never heard one talk during davening, or get a phone call.
I know someone that has one, and I davened at the same Mincha minyan with him many times. One time the dog was quietly hiding under the table, and someone carelessly pushed a chair in on the opposite side of the table, and hit the dog with the chair legs. The dog jumped and looked very unhappy, and for a moment I thought he would attack the Shor Hanogach. But he never made a sound, and his owner held him back by the handle (or whatever it is called) and he calmed down quickly.