I've hurt my back because I played with a dog who guards my university. I‘ve been to university for a year but I didn't know he was there to guard. I wish I had known earlier. if I had known I could've played with him every Saturday! I love dogs! when I met him for the first time, he was sad so I thought he wanted to play with someone. then I did what he wanted. but I think I tried too hard. he's a big dog and he was so happy and he tried to tackle me and I got injured. but I do not regret it because I love dogs..!