We're looking after a border terrier for a while while her family get some things sorted out. She's settled in really well, but it's just dawned on me that when she's at home, she's left alone for some of very day (with a dog flap and access to a big enclosed garden. Because i can, i've been taking her everywhere with me- but I shouldn't be, should I? I should be leaving her at home so she doesn't get out of the habit. Is that right?