According to Dr. Oz, varicose and spider veins are the result of a similar process that involves how well blood travels through the venous system from the lower legs back to the heart.
Baby rabbits stay with their mothers until about 10-12 weeks, this is when they are able to move around quicker, avoid predators, and forage on their own. In the wild they should start adventuring out of the nest at 5 or 6 weeks to start learning from mom. At least 6 weeks.
The reason a puppy needs to stay with its mother until at least 8 weeks is because there are vital things that a puppy learns from its mother and litter mates that no one else (with the exception of a foster dog mom and foster pupsibs) can teach him or her.