I have a female rescue dog -- have had her almost a year. She's small, about 2 years old, curious about other dogs we see on her walks but she gets aggressive-defensive if the other dogs are too hyper. She follow me everywhere although she likes to play with the cats, but she can get over-excited and a bit rough with them. Anyone have any experience with rescue dogs? Should I get another little one to keep her company? I was thinking a docile mature dog, who wouldn't threaten her -- does this make sense? Would another female be better, or a male? (Neutered of course).