Archer spends a fretful night in Sickbay with Dr. Phlox after Porthos, Archer's pet beagle, picks up a deadly virus on an alien planet. Meanwhile, crew members believe Archer's increased stress level is due to Porthos' illness, but Dr. Phlox suspects it has to do with Archer's repressed sexual tension and urges Archer to discuss it with T'Pol.
