Chihuahuas can indeed be service dogs, surprising as it may seem due to their small size. They are alert, agile, and caring, making them suitable for tasks such as seeking help for epilepsy or assisting the deaf. However, not all Chihuahuas are fit for this role, as some may be too aggressive. They are best suited as emotional support dogs, providing comfort to individuals with depression or anxiety. Chihuahuas can also guard their owners and detect changes in blood sugar levels, making them valuable service animals.