I have a 9/10 year old Choc Lab mix, Chevy. We got her in 2004 and since we have had her she has had problems. We found over 40 ticks on her the first night we had her. She has limped on and off over the years. The main problem is she licks herself constantly. Last she licked herself bald. We took her to the vet and they tested for allergies/mange/fleas, basically anything that could be wrong. She has open sores we spray with Lanacane and Bactine. We took her to another vet before we moved who gave her some pills that were supposed to stop the itching , all it did was give her bad gas

. We think she has a psychological problem since she shows signs of abuse; terrified of certain noises, correct another dog/animal/person she runs and hides, looks like someone broke her leg(s) at one point and were not fixed correctly. She also acts like she has no sense of smell at times. Can't find food/treats on the ground.
Can anyone help?