As a detective solving the mystery of the crossword clue ‘2020 film starring a cartoon dog‘, my first thoughts were to consider movies that have been released in recent times and have ‘cartoon dog‘ characters in them. A few names that popped up in my mind were ‘The Secret Life of Pets 2‘ and ‘Spies in Disguise‘, but both of these movies were not released in 2020. Then it occurred to me that SCOOB, an animated movie featuring the popular ‘Scooby-Doo‘ character, was released in 2020. In order to double-check my hunch, I did further research and found that ‘SCOOB‘ was indeed the correct answer to the crossword clue. The name ‘SCOOB‘ makes sense as well, given that it is a fun and catchy abbreviation for the famous character’s name. So, based on my deductions, the answer to the crossword clue is ‘SCOOB‘ – a movie that undoubtedly delighted audiences with its funny and adventurous storyline centered around a cartoon dog.