The correct spelling for the word "perillo" is actually "perrillo." The use of double "r" and double "l" is important in Spanish language to signify specific sounds. The IPA phonetic transcription for "perrillo" is /peˈriʎo/. The "e" sound is pronounced as in "bed," while the double "r" is pronounced as a rolling "r." The double "l" is called a "palatal lateral approximant," pronounced as a sound between "l" and "y" in English. So, the correct pronunciation of "perrillo" is "peh-REE-yo."