Hi, I used to run with my dog, but the present two are a bit too old for it, but I run 1st & take them straight out for their walk as a warm down/stretch.
Years ago we had a Boxer who we used to take walking in the mountains etc & I ran with her everywhere (except club nights). She would happily run 10 miles at 7-8 min miling pace. Normally she would be infront (off lead) but even so, be prepared for the know-all do-gooders - many people shouted that I was cruel for making her run!!!
More recently we had an unfriendly Boxer Boy, so I used to run on tracks/trails at night. After falling over him many times, I got a flashing ring/collar (for him, not me) - suggest you get one of those.
lstly, you will need to build your dog up to speed/distance gradually - just like youi would a non-running friend.
Good luck