Our expert says:
Many other diseases and drugs that can affect a dog's thyroid level these can cause the thyroid levels to be low + euthyroid sick syndrome. Generally speaking a dog with an underactive throid puts on wt/battles to lose wt, has a slower than normal heart rate and can develop skin problems. From what you are describing I would definitely look at testing Liver, Kidneys , GLUCOSE , protein and urine. If these are normal it would be a good idea to think about an ultrasound scan +- chest x-rays
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