My Dog Is Anxious : Was Taken From Mother At 4 Weeks. What Remedy Can I Give?

She is a collie lab x , has got more anxious as she has got older she is now 1yr, paces a lot, barks outside in garden, over protective to us , snappy at other dogs. Was always very gentle as a puppy, and still is i.e never snatches food from your hand takes food very gently, allows grooming, you can take food off her, or touch her whilst she is feeding, comes when you call . High anxiety time is from 4pm to 7pm.