LIKE I SAID ITS A CHOICE...AND AFTER USEING IT FOR 3 WEEKS AND TAKING 6 DOGS(THOSE ARE THE ONES THAT I TOOK) TO THE VET FOR FECAL EXAMS I WILL KEEP USEING IT .... AND AFTER SEEING THE LACK OF "SCIENTIFIC" RESEARCH ON THE EFFECTS OF DE AS A WORMER IN A "DOG" I WILL JUST TAKE THE TESTIMONIALS OF THE VETS AND OTHERS INCLUDING MYSELF AS "MY" PROOF. AND THANKS FOR MAKING ME READ UP ON IT BECAUSE IT HAS MANY MORE BENEFICIAL EFFECTS FOR MY ANIMALS AND YARD .......