What does my dream mean?

in my dream we had a dog that ran away ( i dont own a dog) we waited for it to return and it finally did my brother grabed and we ound out that it was our dog but we werent sure at first because it was so agressive when we brought the dog inside it tried to bite me and did a couple of times and i had to throw him off my brother was yelling at the dog to sit down and stop biting me but it didnt work then i woke up