A Shih Tzu from a shelter comes with its own history. Many of these dogs are hesitant at first but quickly come out of their shell once they feel safe. Then the breed's typical charming stubbornness shines through again: because trainability is in the middle range, patience and loving consistency get you furthest.
Health deserves special attention. Because of their build, Shih Tzus carry clearly increased health risks – above all for breathing, the eyes and the knees. Breed-typical issues include brachycephalic syndrome, eye conditions such as cataracts, keratoconjunctivitis sicca (dry eye) and generalized progressive retinal atrophy, as well as intervertebral disc disease, heart disease and familial nephropathy. Malformations such as cleft palate, dermoid sinus or hydrocephalus also occur in the breed. Responsible breeders have the parents' knees, eyes and kidneys examined clinically, select for open airways and ask about known cases in the line to lower the risk for the puppies – but with a shelter dog, the genetic background is often unknown. Even with the best preventive care, these breed-typical risks can't be eliminated entirely. So strictly limit heat and physical exertion, choose joint-friendly exercise and make regular eye and vet checkups a fixed part of your routine.