I will answer the Q's about probiotics first, but I really do not think that is your dragons problem.
You should never use grocery store yogurt or even most powdered probiotics because they are not good for beardies:
1. Most grocery store yogurt have little active bacteria in them after processing
2. They are dairy based and bearded dragons digestion does not break down dairy or fats well
2. They contain sugar, sugar feed yeast, yeast increases when an animal is given antibtiocs (such as albon for coccidia or other sulfa drugs) and bacteria decreases, so the LAST thing you want to add to thier digestive system is lots of sugar.
4. There is a product on the market called Acidolphiliz that is sold by ReptileSuply.com (under supplements) that we know works well in replacing the good bacteria in lizards and is recommended by most herp vets we know and work with. We have used it for several years and was the first to test it on our rescues, I think this is one of the best products that is available for lizard species out there.
ALthough this can improve his digestion and hunger, dragons this young that are not eating, usually have parasite issues affecting them, especially when they have just moved to a new home. If left untreated and compromising their health now to the point of not eating much, they can be get so bad that the babies can die.
A simple fecal sample to the vet can tell you if this is the problem and what type. In many areas of the country flagellates have been a real problem the past few years due to all the storms and rain run offs into agriculture lands.
If your baby does have parasites and needs treated, then be sure to use the acidolphiliz with any meds he has to take. Not all need meds, some can be controled with really good cleaning and using substrates that they can not reinfect themselves with. But if that does not work, they really need to see a vet and have a fecal
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