If someone does not have a dog to whom will he throw the tereif meat? Not to mention having to know whether or not something is chametz (although when someone told Rav Soloveichik that his dog ate something RS said “Whom do you believe, your dog or me?” and Rav Moshe replied to a similar statement with “Crazy dog”), I personally think that some frum people frown on it because the Nazis ym”s used dogs against the Jews. Chabad also has a problem with non-kosher animals in general that even extends to pictures but Rav Chaim David HaLevi proved that it is incorrect from the flags of the shevatim and the lions on top of aronot kodesh.
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