First, recalibrate your speedometer.
Second, it must be said, pedal strike means "You are doing it wrong!"
Third, the dog earned an extra tasty doggie treat for making you feel like you were going real fast.
Last but not least, the sum dog chase, pedal strike and discovering miscalibrated speedo does not rate as a bad morning. Ferrets are the greatest danger to cyclists. Sheldon Brown, RIP, wrote an entire series of columns about the dangers of encountering ferrets while cycling. These articles always appeared in the April issue of his cycling club newsletter. Sadly, this was in the days before the internet and no copies have survived.