I have a 2 y o jersey giant that turned mean at about 9 months. I was in the garden and he was suddenly on my head! No urgent care visit, but scary. Then he hurt my Jack Russell just for being there. Since the birds free range, I kept a rake at each door to step outside. When the weather cools he calms down, but the last 2 summers have been a challenge. I didn't want to get rid of him for he protects the girls from predators or even getting too close to the road. Here's the funny story:
Last week I had to run to the house for a call, leaving the lawn mower in the yard. Upon completion, he wouldn't let me back to the mower and with no rake handy I was defenseless. I threw my ear muffs at him and jumped on, usually the mower scares him. Not this time! I roared away. The birds always follow the mower snatching up tasty treats. On one round there he stood in my path not moving..... I drove right up to him and he sidestepped giving me the eye. I followed him, and as he walked away I continued. He started to run, I sped up, and chased him for about 30 feet. He is afraid of me now! I even patted him yesterday and he squawked and flew away.