Potbelly Piglet Constipated?

Question
I bought a pot belly piglet about a week ago when she was 3 weeks old so she is now 4 weeks old. She was being formula fed because mom dies :(. The lady I bought her from said she was mixing pellets with the formula so I did the same thing. Piggy just filters out the pellets, and eats only formula and leaves the mushy pellets in the bottom of the bowl. She does eat very well (formula) and has lots of energy, loves being held and is litter box trained already.
Because the formula costs and arm and leg and switched her to gerber Rice cereal. I have made it thicker than the formula, about the consistency of cream of wheat and have still been sticking pellets in. She does the same thing, filters the pellets and I'm assuming in due time she'll learn to eat the pellets. However, since I've switched her to the Gerber Rice Cereal she has pooped once which is down from about 4 times a day when she was on formula. That was Wednesday. She had no poop all day thursday and nothing yet this morning. Could she be constipated? What can I do for her? And, am I doing the right thing by her feedings? thanks so much!

Answer
Yes, the rice in the cereal is making her constipated. Switch her back to formula for another day or so until she's regular again. Add some canned pumpkin to the formula. Canned pumpkin helps constipated pigs poop. If she doesn't poop in the next day or so she may have an internal blockage or other problem that's not related to her diet, and she may need to see a vet.

Try using Started pot-bellied pig pellets. The starter pellets contain milk and the pigs think they are much tastier than regular pellets. Make sure the pellets have no signs of mold, rodent droppings or insects. Good pellets smell fresh (or have no smell at all). Do not give her pellets with mold, or a sour smell, or pellets that have clumped up into an ugly lump or have disintegrated into dust.

When she's back to normal, put the pellets and regular cows milk in a blender and blend it all up together until it's smooth and drinkable. She might not be happy about the change in taste from formula to milk. If she rejects it, take it away. Do not panic. Do not give her anything else, no treats, no milk, no formula. Wait an hour or so, then offer it again. If she rejects it again, take it away again, do not give her anything else, let her wait until her next meal. By then she'll be too hungry to play Picky Pig and she will drink the pellet milkshake.

Over the next few meals blend the pellet shake less and less. Finally, instead of blending, just put the pellets in the milk, let them soak, and stir it up. Again, don't worry if she plays Picky Pig for a meal or at most two. If she skips three or more meals, it's time to worry.

The next step is to gradually reduce the amount of milk at each meal, until it's just soaked starter pellets.

Finally, start mixing regular pellets in with the starter pellets. At each meal add more regular pellets and fewer starter pellets until the starter pellets are gone and she's eating regular pellets.

Also, while you're doing this, carefully monitor the treats she gets between meals. If she realizes that she can skip her pellet meals and fill up on goodies a couple of hours later, it will be much harder to get her to eat the pellets.