Hello and welcome to Pet Talk!
Thyroid disease is very common in golden retrievers. My 7-year-old golden was diagnosed with it about a year and a half ago and has been on thyroid medication since then (levothyroxine). I'm puzzled that you have heard so much negative about it as I never have and certainly haven't experienced anything bad with my boy Tommy. His coat came back nice and thick (the reason I had the test done was because his coat seemed to be thinning and more brittle) and he also lost weight and really trimmed up, although I also changed his diet around the same time to a grain-free diet so I'm not sure if it was just the thyroid med or not.
Again I haven't spoken with anyone who has mentioned any horror stories, nor have I seen any posts about problems with it here. For my own experience, I haven't noticed any negative effects from it. I hope this helps!
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