When caring for a Shih Tzu, avoid overfeeding, as they are prone to obesity. Do not skip regular grooming, as their long coat requires frequent brushing to prevent matting. Avoid leaving them alone for long periods, as Shih Tzus thrive on companionship and can develop separation anxiety. Do not use harsh training methods; instead, use positive reinforcement. Additionally, avoid exposing them to extreme temperatures, as their short snout makes them susceptible to heatstroke and breathing difficulties.