my family and I are going through an experimental phase with GSDs. We currently have Arya (2 year old female) and we’ve recently introduced her to Cesar (5yr old male) We’ve had Arya since she was a puppy and she’s generally a sassy dog. She plays well with others and we’ve never had her show any signs of aggression. When first introducing the two they didn’t really mess with each other. Arya being a curious pup sniffed him and is making some low growling noises when they play or chase each other. Cesar is also very protective of one of his toys and has snarled at Arya. He’s also not comfortable with Arya sniffing at him and also growled and shown his teeth at her. Is there anything I could do to help their bonding process. And should I even be trying to bond the two. Cesar is fixed and Arya isn’t. I’m not sure if this means anything but I felt this might be necessary to know.