Pet Care Needed

Spot is our short haired border collie. Shes 4 1/2 years old. Shy at first meeting. My husband and I are retired. We keep busy but she is accustomed to human interaction on a regular basis. She is completely house broken, will bark at someone approaching the door, but once shes sees no reaction from us, she settles down rather quickly. Does not like confrontation or aggressive dogs, shell walk away as opposed to engaging. Shes at the high end of medium, around 72 pounds.