What should the accepted thyroid levels be in dogs?

Does anybody know?

they vary within a normal range (don't know what they are) but I know that low normal in Northern breeds like mine can still be under active.

checked in 'Blacks' and it doesn't list any levels in there, sorry.
Chris

Does this mean anything: Canine T4 normal (ug/dl)        0.8 to 3.9
                                                             (nmol/L)      15 to 50

Here you go.

http://www.cslabs.co.uk/canine%20thyroid%20page.htm
Dawn R.

That's great thanks, not for me, but someone enquired this morning and I didn't have a clue!