The Clone Stamp tool like my first tutorial can be used to make more than one of something but it can also take things away like in my example.

Before and After

Step 1
Open your picture and select the clone stamp tool. Make your settings as mine:

Step 2
In my Before picture the grass is the substance I will be using to cover the dog. Take your clone stamp tool and click Ctrl over an area of grass away form the dog and slowly go over the dog until it is fully gone.

Other Examples