How do you melt carob chips for dog treat icing?

Hi, I've been trying to melt carob chips to be used for frosting dog cookies but the chips won't melt into a smooth mixture :(

I also read somewhere about using paramount crystals but I am unable to find them where I live. Any advice/ suggestions will be most helpful.
Thank you

Chef's Answer ~ You can find paramount crystals or coating flow crystals at K9 Cakery.com. You will also find all kinds of other dog treat decorating and baking supplies, many of which are sugar free. I hope that helps! :)