I'll never see his little white nose twitch anymore , never kiss his head goodbye , never tickle his ears or scratch his butt or feel his tiny tongue on my fingers again . I didn't get to see him as often as I wanted , but coming home will never be the same without him there to greet me . When I go home in two weeks , we'll bury Charlie in Mom's garden next to my guinea pig's departed mom . I miss him terribly . 
Question: Why are they writing about Charlie ?
Charlie was their favorite pet .