Here is an blog post on the connection between dogs and spirituality. It includes a touching anecdote from Levinas on a dog’s recognition of his humanity:
There were seventy of us in a forestry commando unit for Jewish prisoners of war in Nazi Germany. . . . We were beings entrapped in their species; despite all their vocabulary, beings without language. . . . How to deliver a message about one’s humanity which, from behind the bars of quotation marks, will come across as anything else than the language of primates.
And then, about halfway through our long captivity, for a few short weeks, before the sentinels chased him away, a wandering dog entered our lives. One day he came to meet this rabble as we returned under guard from work. He survived in some wild patch in the region of the camp. . . . He would appear at morning assembly and was waiting for us as we returned, jumping up and barking in delight. For him, there was no doubt that we were [human].