Lethargy, weight gain, changes in the coat, and reduced activity are signs often associated with aging in cats. However, these findings may also indicate an endocrine disorder that is still not widely recognized in feline medicine: spontaneous primary hypothyroidism.

The vitamin panel is a laboratory test that assesses the levels of essential vitamins in an animal’s body. These substances play fundamental roles in metabolism, immunity, neurological health, growth, and tissue maintenance.

Changes such as increased water intake, increased urination, weight gain, and changes in the skin and coat are signs frequently observed in routine veterinary practice with dogs. However, when these findings are present in breeds with an endocrine predisposition, such as the Shih Tzu, they may indicate hormonal changes that require further investigation.