Logo should contain "Certified Cuddlers". Other than that, no requirements. The audience may be worldwide. We are thinking of something like a globe and a heart perhaps...probably a circular image, like you would see on a stamp of approval, or an official certificate.
If you google the phrase, "certification program logo", and look at the images, you'll see something along the lines of what we're thinking.
A better description of what a "professional cuddler" does can be seen at www.cuddleuptome.com. We have developed a training program, and want to train and certify people. Certified Cuddlers is that business, and we want to be seen as the only legitimate training program out there....so the logo for Certified Cuddlers should be more 'official' than 'playful'. It should be a logo that goes along with accredited professionals.
To further illustrate, here are 4 unrelated certification program websites for other industries. Certified Cuddlers would be similar:
http://www.ncbtmb.org/
http://acbsp.com/
https://www.achs.edu/
http://nanp.org/