HOW CAN A I TAKE THIS ADDICTION OF MY DOG?

i have 3 year old doggy and he was in the shelter cause he was hearting by peopleses the this guy got hem there he was going to put him back in the shelter but we got him .. he is Pomeranianiaan and keeshound.... the thing is the he loves play balls... especially soccer balls.... i want to take him to the park but the are alto of Play balls and soccer so he gos and get them he bite the leash and try to bite us cause he wants them no matter wath.... it was because the was the only toys when he was a puppy ......... so how can i train hem to dont like them i cant Special trainer doest doset let me please help me?