The dog is pretty playful during the day but around sunset she withdraws to her sleep area which has a few beds and open crates with blankets in them, etc. There are a few dogs in the house, all small and they always have got along well. So the dog just wants to go in her crate and lie there. Usually the dogs would lie on our lap until it was time for them to go to sleep around, 9 pm She also starts shaking with her tail down during these retreats. She would always be up and about looking out the window when it was dark. We wonder if something outside scared her at night? She's acting depressed, if you could call it anything but only at night We called the vet and she said that if she doesn't have any physical symptoms to wait another week and maybe bring her in. She's a maltese, 2or 3 years old. thoughts?