I have a rescue dog (1.5 yr podengo cross breed, rescued from Spain). She has always been wary of men and became aggressive to visitors to our house after we had had her for 2 weeks. Fast forward 5 months. Visiting my mum at her house. Brother in law came in the back door. Doggie barking and growling at him. As he walked past her she bit his hand. I'm gutted. I think this would have happened before but we have been careful to separate her. She knows my brother in law and hasn't gone for him before although she is wary of him. She is quite aggressive in the lead to men and barked at a small boy the other day. V worried.