Source- https://www.thespruce.com/top-small-dog-breeds-1118155
Not citing the source of photos (images) is plagiarism. Here is a post on why this is bad, and here is how easy it is to find allowed photos.
Not indicating that the content you copy/paste is not your original work could be seen as plagiarism.
If you are actually the original author, please do reply to let us know!
More Info: Abuse Guide - 2017.