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How to care for an ornate horned frog
Buy from a reputable pet store.
If you can, visit a couple of different pet stores before you decide on a frog. Stores have different quality standards of care, so some stores will have healthier frogs than others.
Buy the healthiest, most robust specimen you can find-it will be easier to care for, and is likely to live longer. Only buy a frog if its tank is clean, with no feces floating in the water.