Teacup dog breeds are controversial, and the AKC doesn't even register them. Some vets warn against them because they are often seen as unhealthy runts who weigh less than 4 pounds.
Greyhounds are not high-energy dogs. Instead, they are couch potatoes that want to go for walks every day. They are easy to control, can be trained
Frenchies = happy dogs with little patience. Need modest exercise & structure. Minimal grooming, although skin and lung problems are possible.
Chihuahuas are small canines that are easy to care for and have bursts of activity. Watch out for their domineering behaviour by setting limits
Cavalier: tiny to medium, calm, friendly, and flexible. Happy snuggler. Often have health problems. Low-shedding, needs grooming. A good couch mate.
Westies are ideal little to medium-sized dogs because they are calm, easy to teach, and healthy. Some grooming is needed; the coat can be brushed
Brussels Griffons are little, cute, and active, yet they don't need much care. We need some basic training. Wiry hair has to be brushed. Breed is mostly healthy.