How to create a peanut butter dog toy in CAD?

I was wondering if some kind soul could recommend a tutorial or guide for creating rings of ascending hollowed out cylinders, like in these dog toys:

http://theilovedogssite.com/wp-content/uploads/2014/10/Kong.jpg

I figure it would be too much to ask for someone to just whip this up who knows how but I basically am looking for the negative image of this. I feel like I Can get to the negative image part myself, but something as simple as creating this exact object is really difficult for a beginner.

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I would make a sketch in the XZ plane. make connecting half circles on one side and then use the rotate sketch tool in the part design workbench.
See my example:
Kong toy for dogs

 
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