The person whose opinion or testimony you are using qualifies as an expert. The information is based on your expert's first-hand knowledge. A well developed topic sentence paragraph will be much longer than most of the paragraphs you are reading on these web pages. Writing for the Internet is usually very different from traditional academic writing. One primary difference in these two types of writing lies in the length of paragraphs.
Paragraphs tend to be much shorter in e-mail messages and on web pages.
In your final drafts for this class, you should write fully developed paragraphs, which are at least eight sentences long. I do not generally care for counting words, pages, or sentences in student writing, but for paragraph development, I've found that fewer than eight sentences generally do not constitute a well developed paragraph according to academic writing standards. On the other hand, having eight sentences in a paragraph does not assure that you have a fully developed paragraph. So Caleb refers to the specific, unique example . We cannot get any more specific than to use the proper name of one specific dog.