When we got Jack from the rescue home he had lots of problems as we expected,one of was nipping our legs when walking away from him ,but also biting more than just playing.We have an old Kong from our previous dogs that Jacks adopted and that stopped his biting habits,but also allows us to take it from him when playing without any reaction.we still have a long way to go ,but after all he`s only 7 months old and never had any proper attention.

Don`t give up.