My leopard gecko isn't eating well. He will eat a silkworm but it comes up undigested the next day?

Check your temperatures, as if the temperatures are too low, then the gecko won't be able to digest the food. He could be impacted because you're housing him on sand. Go to a reputable reptile vet.

I don't know what's happening, but I know you need to take your pet/friend to the veterinarian immediately. These are serious symptoms, especially the fact that you have seen no bowel movements. Please don't wait any longer.

I hope you've gone to the vet before now actually.

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