Is "Synthroid" effective to treat normal hypothyroid symptoms such as weight gain?

"most common sign of hypothyroidism is increase in body weight, with almost half of the affected dogs demonstrating this sign"
http://www.atlanticstatesbriardclub.org/thyroid.htm


"In patients with normal thyroid levels, doses of SYNTHROID within the typical range used for hormone replacement are not effective for weight loss."
http://www.synthroid.com/hypothyroidism/default.aspx?s_mcid=google-ppc&cid=ppc_ppd_synth_ggl_synth_1546


I am going to interpret this statement to mean that the synthetic thyroid hormone brand name "Synthroid" is ineffective to treat normal hypothyroidism side effects, such as abnormal weight gain.  


Conclusion:  Synthroid is INEFFECTIVE to treat normal hypothyroid symptoms!


They said it--not me!