Usually your dog will let you know.
I live in Ottawa, Canada and it gets REALLY cold here, especially with the wind chill factor.
You said it was 5 degrees in Oregon this morning ... There are some days in Ottawa it's -34 (-30 F) and with the wind chill -42 (-45F).
And I'm still outside with Kyleigh! Those days we aren't out for 3 or 4 hours (I would freeze to death) ... but at least for a good solid hour or so - as long as she's running, and on these days I take her into the woods, not a field.
On our "normal" cold days of -28 (-20F) we are out for 3-4 hours ... again, walking / running ... as long as we are moving.
Just mellowing - Ky LOVES to sit on the deck in the icy cold weather. She's great at letting me know when it's time to come in. I checked with my vet and he said as long as she's got a full belly of food ... she's fine for about an hour or so ... EEEKKK to my mind LOL ... but when she's in the backyard just hanging out I stay upstairs so I can monitor her (worry warts that we are!)
Marionís Zoo-Kyleigh, Raylan-cat, Echo-TAG,
Last edited by Kyleigh; 12-20-2012 at 08:57 AM.