What, if anything, should I do for my dogs before winter?

[geoffh4]

I have two shelter mixes.
One is a fairly thick beagle mix and one is a very thin lab/whippet-ish mix.

They were both born and "raised" in Virginia. Recently I was transferred to Boston and my pets and I are adjusting nicely.

However, the weather is beginning to get a bit cooler and I'm a little nervous about them in the heart of winter.

Do they need coats or something to keep warm? Do they even make coats for dogs that weigh 50 pounds?

I'm particularly nervous about the lab mix as she has arthritis in her knees (luxating patella) and had an ACL repair (with the plate in her knee). The vet suggested dog leg warmers but I know these will make it difficult/awkward for her to walk and she will not like wearing them.

Any ideas?
Thanks!