How many letters does the top answer for “wrote dog years” have?

The most common answer is grass (5 letters).

Crossword clue: wrote dog years

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

grass 5 letters wd-fact-v3

narrow-leaved green herbage: grown as lawns; used as pasture for grazing animals; cut and dried as hay

author of dog years 50% similar → grass

wrote a good year 50% similar → crowe

wrote reservoir dogs 50% similar → keitel, tarantino

wrote straw dogs 50% similar → peckinpah

wrote the dogs of riga 50% similar → mankell

wrote the heart of a dog 50% similar → bulgakov

wrote the year of the hare 50% similar → paasilinna