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To find a vet that works with frogs, contact local veterinary schools or look online for lists of veterinarians that work with amphibians. For example, you can look at the website of the Association of Reptilian and Amphibian Veterinarians.  If there are several vets in your area who work with amphibians, make sure the vet you choose is the one that has the most experience with tree frogs. It's a good idea to find a vet before your frog is actually sick. Having an established relationship with a veterinarian that treats tree frogs will make it easier to get your pet quick care when it needs it. It is best to have your frog checked out by a veterinarian if you see a symptom of illness. While you may end up bringing your pet in for a problem that is non-existent, it is better to be safe than sorry. Some diseases require quick treatment in order to be eliminated. If you suspect that your tree frog is sick but you are unsure about bringing it in to be seen by a vet, at least call the veterinary office and talk to them. Tell them about your pet's symptoms and ask them if they think your frog needs treatment. If your tree frog is indeed ill, your veterinarian will begin its treatment and will give you instructions on how to continue treatment at home. Follow these directions and be sure to continue treatment for as long as your veterinarian suggests, even if your tree frog seems completely healed. If treatment is not minimizing your frog's symptoms or they are getting worse, contact your vet once again. It may be that your frog needs a different type or amount of treatment.
Find a vet that is experienced with treating tree frogs. Take your frog in for an examination. Follow your veterinarian's suggestions for treatment.