Hello and thanks for reading, my 2 yr old female abby has been a good dog since we got her. She was left abandoned in a farm and we got her at 3 weeks, the owners left with her mother and left abby behind, recently she has been very protective of her space, she was sleeping on the couch and my daughter nudged her to move over, abby bit her toe and shoed aggression with my wife when she went to see what was going on, we were shocked to say the least. She has a very loving home and is exercised daily, i dont understand and dont want a pet that is a threat to anyone, nevermind my daughter. She has gone through basic training. Ive owned 2 dobbies prior with no issue. Perfect dogs, any advice would be greatly appreciated as the alternative is not good.