exercise intensity question

my 2 year old dog has a lot of energy and runs fast. she likes to run beside me when im on my bicycle which is a lot of fun, but im worried that it may do some damage to her even if she does not show signs right now. is it bad for a dog to run too far too fast even if she is not struggling or showing signs of exhaustion? i want her to have fun and exercise, but not at the expense of her future health.