Pets and livestock such as dogs, cats and cows are mammals, which means that their thyroid glands work in the same way as human ones. However, since the dosage for animals is much lower (depending on the species it is between 10 and 1000 times lower than for humans) it is not advisable to administer iodine tablets to animals. Only cows would tolerate them well; these tablets would represent a massive overdose for all other animals. If you are interested in further information, please talk to your veterinarian the next time you see them and show them this leaflet, which contains additional information about use in animals.