tashakota:So I hope that this may be a result of him just being sick but the fT4 should tell us right?
I really, really wish it was that simple. Please read this entire article: http://rivercitypetwatch.com/files/Diagnostic_dilemma.htm
"A common condition known as compensatory hypothyroidism, or sick euthyroid syndrome (SES), may account for many of the false diagnoses of hypothyroidism. The difference between true hypothyroidism and SES is that in SES, the thyroid gland retains the ability to return to normal function. SES describes the situation in which dogs with normally functioning thyroid glands have decreased thyroid hormone levels with an appropriate cause. Virtually any condition trauma, stress, injury, illness, poor diet can affect thyroid hormone levels and cause SES.
SES is actually a protective mechanism. When the body experiences altered demands and priorities such as illness or stress, the thyroid gland tries to compensate by minimizing energy requirements. Energy is conserved by reducing thyroid hormone secretion. This, in turn, lowers the body's metabolic rate."