DDR would definitely need an active home and good training but no, you don't HAVE to train protection sports. I have a DDR/Czech male, 16 months old, active family companion right now who has the grand job of alerting me to anyone at the door. He's been very slow to mature. He's good with kids, though excitable at times. My kids he's kinda rough on but kids outside in the neighborhood, he's good with. But he knows he can rough house a bit with my kids.
He also has my 4 year old female GSD to play with too. Though she is a couch potato, even more so in comparison to him. She is content to lay around all day sleeping while he is ready to go and then some. If I don't get the chance to work him even a little bit during the day, I have to crate him at night because he'll be up pacing the bedroom all night otherwise. Also he's pretty mellow in comparison to those of his lines doing bite work but still a handful.
Why are you looking at DDR lines? Any GSD lines can be a good active companion with training and time put in.
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