Yep, Karen at AllDogBoots is the lady to speak to!
Unfortunately, Harry won't keep ANYTHING on, full-stop....
So when it's icy/snowy etc here, I use Mushers Secret. It's a wax that we apply to Harry's feet, it's brilliant and stops ice impacting between his toes too. I dries kind of clear, so doesn't ruin your flooring, either. I get it from Amazon
Good luck! Sally + Harry x