You think you have problems, I got so many disapproving looks from other dog walkers this morning with my nudist greyhound!
I bet Kiera has more hair than Mollydog, but Molls seems to have the most amazing circulation : she just hares around like a loon in the cold, her ears are warm, she grins, she dances - and she does not shiver. The only time she looks depressed in the cold is if I make her wear a coat (well, unless it's *VERY* cold : it was aroudn 0 degrees this morning and she didn't want her coat - which is a really thin one because she hates the thick ones even more!)
Az does feel the cold and you can definitely see the difference : I wrap him up in jumpers and coats and he really needs them : he's so obviously more happy wearing clothes, and without them stands there shivering and looking pathetic. And Az is much more robust in the cold than my mum's whippet Flash, who is currently wearing two thick coats and a snood for walks and I thijnk would quite like a jumper to wear underneath...
Mum used to put coats on her collies, and they didn't object - but since she's had Flash, she doesn't usually bother any more, she says that compared with Flash it's obvious they don't really need them.
If your pair don't feel the cold then I wouldn't worry about it, they obviously have great circulation and a brilliant internal heating system!
I have noticed that Molls is hungrier than normal, and have upped her food a bit and given her some olive oil on it, cos I reckon she must be burning more than normal staying warm.