Beijing, Xishi, Bago, Zhong and Bulldogs with convex eyes are prone to have eyelashes inserted inversion. Salpi's head has many wrinkles and makes it easy to turn inward the eyelids. White VIP, Beijing, Maltese and Pomeranian are prone to clogging of tear ducts and have two obvious tears.
The short nose of Beijing, Xishi, Bago, Quanshi, and Zhong are prone to retracting their noses and turning the trachea, which is prone to laryngeal, tracheal atrophy, and snoring.
Small dogs, especially super small dogs, are prone to permanent teeth side by side, blocking food debris, causing tartars, periodontal disease, bad breath, and finally losing teeth. Dogs who like to eat soft foods are prone to eating food due to tartars, bad breath, and toothache.
Small dogs are fragile because of their small skeleton and are most likely to break bones. A deliberately improved mini-small dog is prone to brain edema, diseased, and tibial lip.
The pelvis of small dogs is narrow and prone to difficult labor. Dogs or places with many mosquitoes in outdoor living have a higher chance of getting it. Dogs who lack exercise are mostly consuming bones and meat, and dogs who lack exercise are prone to poor appetite due to constipation.