Alright, Theo is a 7 month old Golden Retriver / Rottweiler cross. He's a big boy at 65 - 70lbs. He's pretty close to full size but he's got a ways to go. Anyways, when he was younger food was a big deal for him. He used to growl and bite at whatever tried to take it from him. I fixed it. Well I thought I did. Now months later it's back. He was tied up for crossing the street and trying to play fight with some lady's poodles. I gave him some food and Kerra came to share it. He attacked her! They fought for a minute then I yelled and pulled Kerra away. Theo lowered himself and placed his tail between his legs and went back to eating. Kerra walked past him and he attacked her again! Sometimes he will try to play fight with her and she will get mad and it turns into a fight. How do I fix this? Sorry to write so much but I don't want to lose my babies!!! HEEELLLPPP!