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Written just after Davy had gone through a bitter campaign from which he had emerged triumphant , it is a bold pronouncement that he wears no collar marked " My dog - - Andrew Jackson . Alpha acid , the bittering agent used in brewing beer , is the primary marketable component of hops . The DDAL and The HSUS have worked together on many issues , including greyhound racing , the testing of household products and cosmetics on animals , the addition of bittering agents to anti-freeze to protect children and animals , and providing relief for the animal victims of Hurricane Katrina . In bitter February it is quiet , the sky leaden grey and the ground soft white . Can we resist the natural tendency to become more intolerant , suspicious , bitter , and militarized ? She knew there were earnest men who sought companionship with women , and it seemed strange to her that they should look for it among society maidens ; and , failing to find it there , should become bitter and come to scoff at all women . True , a people 's referendum would need careful design to ensure people do not have to vote every week , and that they vote on meaningful questions , not blind tosses between bitter and acid . This legislation requires engine coolant or antifreeze sold containing more than 10 percent ethylene glycol to include denatonium benzoate ( or other equally effective , aversive agent ) at a minimum of 30 ppm as a bittering agent so as to render it unpalatable .