The Chronicles of Sheldon Mayer's Sugar & Spike
Sugar & Spike #9 
Reprints: Coming soon...
Dedication: Dana Brown (age 9), Idaho
The Wilsons take the kids to an amusement park, even though Mrs. Wilson isn't sure they're old enough even for the "kiddy section". Of course the kids manage to get loose, and soon find a baby pony. Of course, it being a baby means they can talk to it, since baby-talk is the same for all species, and the three of them go off on a little adventure around the park, which ends up being quite costly for the Wilsons. That'll teach 'em to pay more attention when taking care of the kids.
Cute little story, I especially liked the presence of a lot of one-shot people (and animals), which gave Mayer a chance to show off some of his other cartooning skills.
Characters: Sugar, Spike, Mr. Wilson, Mrs. Wilson, a pony, various park employees and visitors
"Boy! I wish my mommy was a baby pony! She doesn't understand a word I say!"