A graduation audience in New Jersey roared in applause as a beloved service dog had his day.Grace Mariani graduated with an education degree from Seton Hall University on Monday. She went across the graduation stage alongside her constant companion Justin, a 6-year-old service dog dressed in a cap and gown of his own for the occasion.University leaders were sure not to leave Justin go empty-handed. The yellow lab and golden retriever mix also received a diploma for attending all of Grace's classes over the years.Watch the sweet moment in the video above.