Hyperthyroidism is over production of thyroid hormone and can be one of the most common hormonal conditions affecting older domesticated cats.
The most common presenting symptoms are:
Rapid weight loss,
Rapid heart rate
Other symptoms include hyperactivity, possible aggression, an unkempt appearance, and large, thick nails. About 70% of afflicted cats also have noticeably enlarged thyroid glands.
If left untreated hyperthyroidism can be fatal but it can be very easily controlled and treated with medication or surgery.
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Dogs tend to suffer more from under-active thyroid.
This results in a wide range of clinical symptoms but commonly :
Poor coat condition
Again, it can be easily controlled and managed with medication once a diagnosis is made.