The Sheltie Shepherd is not a purebred dog. It is a cross between the Shetland Sheepdog and the German Shepherd. The best way to determine the temperament of a mixed breed is to look up all breeds in the cross and know you can get any combination of any of the characteristics found in either breed. Not all of these designer hybrid dogs being bred are 50% purebred to 50% purebred. It is very common for breeders to breed multi-generation crosses.
"Nikki is a 3 year old German Shepherd, Sheltie mix. She weighs about 60 lbs. and is about 5 feet when she stands on her back paws. She is the friendliest dog I ever met and loves everyone, she is great with young children and even newborns. She never growls and only barks at squirrels or other animals that are around when she is in the backyard, she never bites. She loves to play with other dogs and is very good with cats. She is pretty hyper and needs to run around a lot but once she gets out her energy she is calm and just wants to sit or lie down next to you and be pet. She is super smart and learned all her commands and even some tricks within the first 3-4 months I had her, she learnt her name the same day I got her. She loves winter and playing in the snow."