This lovely lady is Cassie. She is a 20 year old domestic shorthair cat. Cassie’s owner recently brought her to see us as she had noticed Cassie appeared to be losing weight. During her consultation and clinical examination it became apparent that Cassie had indeed lost weight despite still enjoying her meals. Further clinical findings included a significantly increased heart rate and a goitre (an enlarged thyroid gland presented as a small swelling in the neck). Individually these symptoms can be caused by any number of different conditions, but together, they gave a strong indication that Cassie may have developed a medical condition called hyperthyroidism.