In 2021, the Affenpinscher crown went to Baker's Acres Howler Monkey at 16.28 mph, just off 2020's 19.11 mph best, clear of the field — the best of 4 ranked. That top speed makes the Affenpinscher the 224th-fastest of 228 breeds in 2021. The top 4 came in at 15.3 mph on average.
See full AKC Fast CAT speed rankings — by breed, by year, and all-time — on Dash-Hound.