This kid misunderstood the actual meaning of “Feliz Navidad”
Although native speakers might disagree, Spanish is one of the most challenging languages to learn. It has multiple verb tenses, conjugation types, and difficult pronunciation. Therefore, it’s only natural for a child to mistake a joyous Christmas song for the presence of fleas on our pets. Take some Spanish lessons and try again, mi amigo.
When this child found out what the song he was singing meant, he probably felt quite embarrassed. There’s quite a difference between wishing someone a Merry Christmas and talking about your dog’s fleas. We hope he asked his father to take him to Spanish lessons so that this wouldn’t happen again. That way, he won’t be the laughing stock when singing Christmas carols next year.