First, religious texts condemn them as unclean, plus the love Westerners shower on pets made them inherently suspect.
He who mixes with unclean things becomes unclean himself; he whose associations are pure becomes more holy with each day.
If it is a good power, the thing is holy; if a bad power, it is unclean.
Certain physiological processes come to have for him an unclean flavour which is yet perniciously attractive.
They purify the soul from the unclean contact with the body and from the dominion of death.
I did not drink wine; I was not allowed to smoke at home, because it was an unclean habit.
Ah, that is the vesper bell, as they call it—the unclean beasts that they are!
Behind her walked a proud gentleman, a lordly gentleman who elbowed his way through the throng as one who touches the unclean.
Did God, then, permit man to use also the unclean animals for food?
On the contrary, they are described as unclean Pagans, who ate all sorts of meat, and some of it raw.