Missing Chloe

I can't help but be sad with my dog Cassie, who is now ten years old in human years, has been alone for two months now, since her younger bestfriend, a shi tzu, Chloe, went to our northern country home in the mountains, with my mother and my sister. Cassie is fine being alone but I do not want her to be like that for the rest of her remaining dog years. Now, I always make sure that I go home right after my class, so she won't be alone at night.