Have you heard of Ceasar Millan, the Dog Whisperer? Are you exercising your dog with daily walks? You might want to read his book. I found a copy at our local library. Ceasar gives you a good insight into how your dog thinks and what he needs. A dog that size would need a minimum of two walks a day. Preferably first thing in the moring and in the evening. The walks would wear her out and she would remain in a calm state and sleep. I strongly encourage you to read his book. As a new owner of a 3-month-old Cocker Spaneil, it's been highly beneficial to me.

Good luck to you!