“Companies are still free to do analysis and growth on these vaccines,” USDA spokesperson Joelle Hayden tells Science, “but with no license, they can not promote or distribute them.” Within weeks, a dog will have a seizure, typically it will later die. [newline]The only factor Packard could determine was both dogs had began sporting Seresto flea and tick collars a month before. Donley, who has a doctorate in cell and developmental biology and is a former cancer researcher, mentioned this “synergistic effect” doubtless extends to pets. He stated he wasn’t positive what makes the two pesticides so prone to cause …