In Photoshop, it’s always been a challenge to make dotted lines until Photoshop CC. This tutorial is going to show you how to make dotted lines in any version of Photoshop, not just CC.
Let’s first look at how to do custom dotted lines in Photoshop CC, then we will move on to the old school way.
The limitation of the CC method is that we can only work with paths or shapes. Vectors in other words.
Check out the video that shows exactly how to make dashed and dotted lines in both Photoshop CC and CS versions here. Then read the tutorial, they are different and supplement each other.
Step 1
Use with the pen tool, or the custom shape tool set to custom shapes or paths. In this case, grab a heart custom shape and choose Shape for the options
I have made a heart custom shape.
Step 2
Next to the stroke, choose the color and width from the top menu. Click on the line next to size to reveal the Stroke Options. This is where you can choose sots, dashes or a solid line.
Step 3
Click on the More options button to set a custom dot/dash style.
here we have a custom dashed path on our heart shape.
Other method of making dotted lines (Raster/Old School way)
Here is how to make a dotted line, the old school way that is supported on every version of Photoshop. Also experiment with different brush tip shapes for some variations, you could even use photos.
See how to make a custom brush from a photo
Step 1
Select the brush tool. (B) 
Open the brushes Panel (F5) or Window>Brushes
Step 2
Let’s change some settings
I chose 5 for the size. Obviously the larger the size, the larger the dots
It’s important to set the brush to hard
Set the spacing for 150% – More to increase the gap between dots
Step 3
You can save the bush if you want to use it again. To do this, click the icon in the bottom right corner of the Brushes panel. You only really need to make it one time and can change the size at any time for a larger or smaller one.
Step 4
To draw a straight line: Click your mouse anywhere, Hold shift and click again. It will connect the dots, with a nice dotted line.
Here is a little example of what is possible with dotted lines.
I created a background and renamed it layer 1. Added a new layer on top and made some dotted lines.
Then I loaded the selection, selected layer 1, turned off layer 2 and hit delete.
Then I added a white background and a drop shadow for effect.
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