My dog treats puff up with air when baking, how can I prevent that?

My baked dog treats tend to get air in them when baking. How can I prevent it. Thank you.

Chef's Answer ~ First, check out a similar question that was answered about eliminating bubbles in homemade dog treats. Then, if these tips don't do the trick, be sure to ask me again and we'll figure out what to do next! :)