Guide dogs: these are dogs used for visionary impaired people. To find the way around the house and other public places. These dogs are trained to be the seeing eye.
Hearing assistance dog: To hear cues like an alarm, doorbell, phone when they ring. These dogs help alert the person in different manners. They also lead the person to the source of the noise.
Mobility assistance dogs: Help people with routine mobility functions like turn on the light. These dogs also help fetch things for the person.
Diabetic alert dogs: Such dogs can sniff out variations in insulation levels in a diabetic person's body. Oral factory senses are very high in dogs. Any secretion will also be detected and the dog alerts on the underlying condition. Seizure alert dogs: The dog is trained to pick up very small details so that the person can beforehand move to a safe environment. Allergen alert dogs: Such dogs are trained to sniff out very particular allergens, for example, peanuts. They will be able to alert the person before eating any highly processed foods with some traces of peanuts in it.