Jogging with my Pyr??!!

She is 2 right?  As long as she wants to do it and you build up slowly, I don't see a problem.  I know that some dogs will keep going after they should have stopped just for the joy of your company.  That is the reason for building up distance slowly, to accustom them to it.  My IW and Pyr jog with me.  They would both be much happier if I moved much quicker, but unfortunately my running flat out is still a lope at best for Max.  I can't move fast enough for him.  I didn't do much more than very short walks at first and have gradually built up distance and time with both of them.  We go to the local ballfield and jog laps around it, that way they are on grass not concrete.  Concrete is extremely hard on a dogs joints.  I was told by a lot of the local pyr owners that their dogs jog with them all the time.  It is great exercise and the vet agreed.
Kathy

Most of our walks are nice and slow. Sometimes nice and brisk. And sometimes Lily LOVES to run as fast as she can for 1/2 - 1 mile or so and I know, one day I will get a heart attack

Actually Jack has had a bit of extra "get up and go!" since we got some snow last week.  He loves to run in the snow.  It's really the first time we'd seen him run full out for more than a "dash".  I think it's a sign that his elbows are feeling better since his surgery.  He still sits with his front feet turned outward but he doesn't limp at all anymore and only seems stiff some of the time instead of all the time.  Who knows - I wish they could talk!