Brian: Portrait of a Dog - S1-E7
Continuity mistake: When Chris and Lois are watching the news on the couch, there is a tall fan on a stand behind the couch next to Chris. Moments later when Peter walks in and goes around the couch, the fan is missing. (00:02:54 - 00:03:21)
Answer: It is just a dish sponge. Scotch-Brite sells pink sponges. There's no particular reason it's pink, it could just show Lois likes pink or one of the animators grew up in a home that always had a pink sponge.
Bishop73