Are German Shephards and Rottweilers good breeds?

Hi everyone. I really want to get a dog and im not sure what breed i want. i want a dog thats really active and loves playing(a big dog). Ive been a fan of German Shephards for many years. Ive heard that they can bite but some say you can train them not to. Do they bite? Ive also caught interest with Rottweilers.... show more Hi everyone. I really want to get a dog and im not sure what breed i want. i want a dog thats really active and loves playing(a big dog). Ive been a fan of German Shephards for many years. Ive heard that they can bite but some say you can train them not to. Do they bite? Ive also caught interest with Rottweilers. Are they good breeds?
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