That was quite an adventure. I fell on my first ride with clipless pedals, and there were no dogs anywhere - just me being uncoordinated.

In my experience, bum bruises heal very quickly.

Make sure you give the road rash a thorough but gentle cleaning with soap and water. It will heal best if you keep it moist with anti-bacterial ointment (or Aquafor if you're allergic to the anti-bac stuff, like I am) and also keep it covered with a bandage. See a doctor if you notice any signs of infection.

http://www.mayoclinic.com/health/cel...CTION=symptoms