Has one of the most deadly left boots in the world and is a strong runner. (justarsenal.com)
They are crawling with fleas and often riddled with parasitic worms, particularly heartworms, which are deadly left untreated. (fotasaiken.org)
The stress and activity of a pet store can exasperate the animal giving the illness a hold (or spreading to other puppies — that are sold without it being realized that they're sick) and that can be deadly left untreated (as was often the case.) (montrealdogblog.com)