I know exactly what you are going through, I am looking after my sons 14 month old chocolate lab and she has been a nightmare at times. She used to pull on the lead and she had a harness but I bought a halti it was £9.99 and it has worked she no longer pulls when she has it on. When off lead I take some of her food with me and call her back at different times, but sadly it does no good if she sees someone as she if off. Kim