 Just place the recommended number of drops on a biscuit or in their water and keep them inside in a dark, quiet, den-like environment. What's even better, now through the 4th of July, all 12 Zamzos are having a sale on our homeopathic drops for dogs and cats, along with our calming chews and room sprays that relax anxious pets. We even have licky mats on sale that release endorphins and natural bully sticks to give your dog something to chew on that lasts for hours.