In England trained dogs take their blind masters to the Musjid.

Answer

It is not permissible to take a dog to the Musjid even if a 'rest area near the entrance of the Musjid' has been set up for the dogs. All annexes to the Musjid are in the category of the Musjid even if they are not part of the Musjid proper. Rasulullah (sallallahu alayhi wasallam) said that the Malaaikah do not enter a home wherein there is a dog. Dogs are abhorred by the Malaaikah. Although it is permissible to have a guide dog, the dog may not be taken to the Musjid and tied or left at the entrance. If this becomes a trend, there may soon be packs of dogs at Musjid entrances.