A drawing I did and uploaded onto DeviantArt on Dec 6, 2009.
I'm posting old art that I loved here as well.

Old Description from the site:
...He's afraid of you and you have that random-hungry-look.

If you can't tell:
Yoshi pets hedgehog, yoshi looks like he wants to eat hedgehog, hedgehog gets scared, hedgehog scares yoshi.

Hedgehogs sees Yoshis are mindless carnavores; eating them at sight. They crystallize (at far) to prevent being eaten. If the yoshi don't move, the hedgehog will try to run past it. Some hedgehogs do not come back out as egg after being eaten; which is why they fear them so much.
[Link]

Originally, I had a picture of a talkative yoshi wearing a scarf scaring a hedgehog with her "complements". I lost it.