When you use Google image search, Google is not your source. It's the tool you are using to find your source. It's important to click on the image and determine the Web site that Google is pulling the image from.
If the image doesn't have a title, write a short description of your own.
Dog in a boat. Digital image. The Leader-Telegram. 13 May 2018, http://www.leadertelegram.com/image543345.