Aggressive German Shepherd Mix

by Katy
(Missouri)

Hi,

My dog is the sweetest guy but he seems to have issues with my brother. ALWAYS has since I adopted him when he was a little over a year old.

Yesterday when my brother was over visiting he attacked him out of no where. He is very unstable when he is around him.... How do I correct this?

My brother always yells at me saying my dog isn't trained and I need to put him to sleep, but he is 100% a different dog around me.

Thanks for any advice!