The first thing you should do when working in Notepad is save your page as HTML. This will save you time and trouble later.
- Click on "File" and then "Save As"
- Navigate to the folder you want to save in
- Change the "Save As Type" drop-down menu to "All Files (*.*)"
- Name your file pets.htm
As with the directory name, always use all lowercase letters and no spaces or special characters in your filename.