|From the episode:||Dog Bites Bear|
"It's So Hard to Say Goodbye to Yesterday" is an R&B song written by Motown husband-and-wife songwriting team Freddie Perren and Christine Yarian for the 1975 film Cooley High and originally performed by G.C. Cameron. In 1991, Boyz II Men re-recorded the song which reached #1 on the Hot R&B/Hip-Hop Song chart.
Stewie starts to sing "It's So Hard to Say Goodbye to Yesterday" at the end of "Dog Bites Bear" after scattering Rupert's ashes at Smugglers' Notch State Park. Brian joins in and the Boyz II Men version is used at the very end of the episode.
- Stewie: How do I say goodbye to what we had?
- The good times that made us laugh
- Outweigh the bad
- Brian: I thought we'd get to see forever
- But forever's gone away
- Together: It's so hard to say goodbye to yesterday