I have adopted 2 adult filas, and had 2 totally different experiences. The first one totally hated me (or acted like it) at first, and was kept confined to a covered run until he finally came around. That was 2 years ago, and he is a totally awesome dog now. The second was was just a week ago, a 3 year old male. He was not bonded to anyone at first, and was kinda like a big brindle lab when he first got here. A big sweet boy. Now he is bonding with us, and doesn't like "outsiders" coming around, just like the other dogs we have.