Our last Mastiff didn't pay any attention to the birds, because that's how I wanted it. He never killed a bird in his life. Our puppy is only 4 months old and everything is a toy. She has sit quietly in the pen while I'm feeding birds and hasn't chased them. I've never trained dogs to guard...
Our Great Dane, Sawyer, just died around Thanksgiving. We had him for 7 years. Lots of times in the beginning I was in contact with the breeder because of issues with the dog that seemed hard to resolve. He would growl at me and posture sometimes which is scary with a dog that big. He was fixed...