Selegiline is used to treat Canine Cognitive Dysfunction Syndrome It can also be used to treat symptoms associated with pituitarydependent Cushings Disease in dogs Selegiline comes in easytoadminister oral tablets with five different strengthsSelegiline is a monoamine oxidase inhibitor MAOI Usage of selegiline is meant to result in enhanced catecholaminergic nerve function and increased dopamine levels helping dogs with cognitive dysfunction caused by aging