3. Weight gain/loss
Is your Shih Tzu becoming fatter? Well, that might be because they are becoming old. As dog’s age, their metabolism slows down and are less prone to exercising. Hence, they put on weight. Also, they might lose weight as well because of oral problems. As they grow old, Shih Tzu’s develop a dental problem which makes them reluctant to eat.
4. Slowing down
As the dog’s age, they tend to slow down, just like humans. They develop thyroid and arthritis which are the main reasons for them slowing down. They might experience pain in their joints while moving around, climbing the stairs, running uphill, or running, in general.