Described here are devices, systems, and methods for treating a condition in an animal. Generally the systems include a stimulator that is implantable in the animal and a controller system configured to transmit one or more signals to the implanted stimulator. The controller system may have a controller configured to generate the one or more signals. The controller system may include one or more collars, bridles, horse hoods, cages, animal beds, and / or food bowls. The systems may be used to treat one or more conditions such as dry eye, and may treat the conditions in an animal such as a horse, dog, or cat.