Aggressive German Shepherd
We have a GS named Koda that is very sweet and playful most of the time. However, he becomes aggressive and actually bit my husband when he came into a space between Koda and me. Koda used to sleep in our bedroom and the bathroom is on my side of the room. The first time Koda showed aggression was when my husband crossed towards the bathroom. He actually bit him.
Koda has also been aggressive with my husband and daughter when I am in the kitchen and they try to enter the kitchen when Koda is there. If he is in another room that doesn't seem to be a problem. So, I'm not sure if his aggression is territorial or dominance. I am his favorite person. Although we all feed him and let him out, for the most part I am the one who plays with him and takes him for walks.
Koda has other issues, such as not allowing us to put a muzzle on him so we can take him to the vet. He has an ear infection (I think) but he won't allow us to actually clean his ears.
However, the aggression problem is the most difficult.
Any suggestions are welcome.