Call of Duty: Modern Warfare 2 Easter Egg - Cod 4 Reference

In The mission Contingency, at the beginning when you reach the first guards,there is a conversation between Captain Price and Soap. Soap says: I hate dogs. Captain Price responds: These are pussycats compared to the ones in Pripyat. This is a reference to Pripyat missions in COD 4, where dogs were quite annoying and came in great and deadly numbers.