One leg may be more sore than the other due to differences in muscle strength, balance, or posture. It could also be caused by overuse or injury on that particular leg.
a leg bone grows more slowly in one leg than on the other leg.
Having one leg more muscular than the other could be due to factors such as favoring one leg during physical activities, injury or surgery on one leg, or a medical condition that affects muscle development.
very sore.
NO, aspirin is harmful to dogs. Better if you soak the leg in hot water, and rub it down like you would your own sore leg.
Bad posture...i know
In a way it can give you more leg strength. You must build your leg strength to be able to pole vault or do sprints in a matter of seconds so yes it does give you leg strength.
Leg warmers would not offer support for your knees , they are used to keep your muscles warm between exercises. I have no idea what you could use other than a brace for sore knees.
No.
put a heating pad on it or maybe ice it?...
proobably because you have a more dominant foot when yoou walk. You can test this by picking a point directly in front of you about 50 metres, close your eyes and try to walk in a straight line. If you drift off to one side, that side is the more dominant leg. To fix it, just becoome aware of it. If you want the other one to be just as big do some single leg rises. Just stand on one leg and rise up and down repeatedly. If you dont want it big, try to stop using it as much and once it gets sore, stretch it out.
It is perfectly normal to have 'some' leg length discrepancy (inch or less). More than this and it may be worth invesitgating.
No.