It’s something that Kevin Hart himself realizes, and he explained it to CinemaBlend during the press day for The Secret Life of Pets 2. His thoughts started with a reflection of where Snowball was as a character in The Secret Life of Pets, and as he gave the remarks you’re about to read, he wasn’t afraid to slip into character, voice and all:
Article source: https://www.cinemablend.com/news/2474476/kevin-hart-details-snowballs-biggest-change-for-the-secret-life-of-pets-2