I think it depends on the topic, the way the piece is written, and whether you can break it up into smaller topics. Here are some things to consider:
-Sometimes short and to the point is better.
-For topics that require in-depth explanations and coverage, consider using section breaks and subtitles. This allows the reader to quickly scan for the information they are looking for. For example, if the reader is only looking for the general temperament of a dog breed to know whether the breed is good for small children, they can scan to the section on temperament.
-Again, can the topic be broken down into separate topics. For example: Write an article on "Signs and Symptoms of Celiac Disease", then one on "How to Diagnose Celiac Disease", then another on "Treatment Options for Celiac Disease".
Keep in mind that many readers on the internet are looking for information quickly and not a book on the topic. But breaking down the topic, whether in different highlighted sections or different articles altogether, allows the reader to scan for the information they need quicker instead of feeling like they are reading a droll page out of a textbook.