new bad behavior

Hello! I am new to puppies and dog forums so allow me to introduce myself... My name is Madison! I am the proud mommy of a beautiful sweetie pie named Bear. He is an 11 month old Rottie and I also have a cute little rescue named George that we just got back in April! Ive had Bear since he was...

I have a South African Mastiff. He has always been very sweet and lovable. However, I was unable to keep him so my mom offered to take him. He is great with her and her other dogs. No aggression towards any of them. However, he does show a lot towards my moms husband. But he never did before. We...