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Ask for certification that the animal is healthy. Look at the hedgehog's eyes. Check the animal's nose. Take a look at the hedgehog's skin. Make sure the hedgehog is well proportioned. Watch how the hedgehog walks.
Reputable breeders will have veterinary records on the parents and proof of vet checks on the babies. They should also be able to give you information about any illnesses or issues that the hedgehog has had, and inform you about any vaccines the hedgehog might be required to get in your area. If the seller seems shifty or unwilling to share details about the animal's health, buy elsewhere. They should be round, bright, and fully open. There should not be any sign of discharge from or crustiness around the eyes, as this can indicate an illness. A healthy hedgehog will have a dry, clean nose. A wet, runny, or crusty nose is a sign that the animal is not well. While hedgehogs' backs are covered on spines, you'll still be able to see some of their skin as they move around. Be wary if you see any bumps, sores, or other odd spots. If the hedgehog rolls over, you can also see its fur-covered belly. The fur should be soft, smooth, and free of any mats or tangles. There should not be any missing patches of fur or areas where the fur is thinned out. A healthy hedgehog will eat well. The animal's body should be plump, with no loose skin. It should not be so fat, however, that it cannot roll into a ball. African hedgehogs, a variety commonly sold as pets, are at risk of a neurodegenerative condition known as Wobbly Hedgehog Syndrome (WHS). Before purchasing a hedgehog, watch it walk. If it wobbles, limps or winces, the hedgehog is not likely to be healthy, and should not be sold. Hedgehogs with WHS will suffer a number of health problems, and likely die at a young age. Reputable dealers will not knowingly sell hedgehogs affected by WHS.