[sandy]

my dogs 9 years old and I've had her from a baby but her behavior has really changed in the last month she keeps on trying to bite men and just the other day she went for a boy she's never done anything like this before just hoping someone can give me advice on what to do.

[Lara's mom]

When a dogs behaviour undergoes a radical change, the first stop should be your vets office for a check-up and some blood work.

[millsandbones]

I think dog's behavior tend to change as they aged. I agree with Lara, sometimes the change in dog's behavior could be caused by medical condition. Better, consult the veterinarian.