(Niles has brought a peace offering to Martin after leaving Eddie in a kennel)
Niles: Dad, it's from Smoky Mountain Farms -- five different meats in one big box.
Martin: Not the Slaughterhouse Five...
Slaughterhouse-Five, of course is the 1969 novel by Kurt Vonnegut. This reference also explains the title card, "With Apologies To Mr. Vonnegut".