After my (first) 5K today, and as my run duration increased to 30+ mins over the recent weeks, I found I was getting 'hip ache'.
So if you do the following exercise (on both sides). You will hopefully notice some relief.
Bend your front knee round and stick your back leg down straight behind you, sit as squarely as you can in this postion (eveyone's body is different, and I am very flexible!).
Then press your legs and bum downward into the ground and hold for a few seconds and afterwards try to do the opposite, lift off the ground and hold for a few seconds... these changes won't be visable to someone watching but will help your hip-joint-ligaments.
Remember to do a few reps on BOTH sides.
PB.
PS - having a dog watch your every move is NOT a requirement.