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The average life span on a great dane is more like 6 to 8 years old.
Many labs can be very hyper especially young adults, my former lab needed 6 hours of hard exercise a day, and there have been several posts that have come up here with others that seen the hyperness as well, they are bred to work all day out hunting
If you look at most large breeds they are working breeds that require stamina/endurance to do their job, so they have higher energy needs and many need something to do to keep them from going stir crazy.
Greyhounds are a bit different, they are sprinters much like a cheetah they must conserve energy to make one all out run at high speed to capture game. Greyhound on the track are raced only every 3rd day much like they would if still a wild breed hunting their own game, for example a large hare can provide them with sufficent food for 3 days before they need to hunt again. Inbetween hunts/races they mostly sleep to recover energy to make another high speed hunt. For this reason they make ideal apartment dogs with walking recommedations being 2 15 minute walks and one half hour walk to keep them sufficiently exercised, and if you can find a fenced in place to let them have a brief run once a week then all the better, this also results in lower feeding costs I have a young more active 65 lb girl and an 82 pound couch potato, both get a total of 1 1/2 cups of EVO a day, if you were feeding a food like Canidae you may need 3 cups for a larger male. If they are feeling particularly playful indoosr they may grab a stuffed sqeaky toy tossing and pouncing around with it for a 5 or 10 minutes. And the majority will rarely bark, As for size range tiny female 45lb to a large male just over 100lbs, even at 2 years old most retired track greys are pretty much settled down.
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