Also can I make the line thicker or more transparent.
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Unfortunately, dotted lines are not supported by Tableau. You can vote up the idea here https://community.tableau.com/ideas/1378 so that Tableau can add this feature in subsequent release.
To make the line thicker follow below steps.
1. With dual axis, your Marks card will look like this. Expand the pane corresponding to the measure for which you need a dotted line.
2. Click on size and increase and decrease the size to adjust thickness.
3. Clcik on color card, and use the transparency slider to adjust transparency
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