I've been involved with Basenjis for many years and can only remember one occasion where one Basenji was startled by one particular noise ( ice cream mixer van starting up), otherwise they seem completely immune to noises even the loudest ones. Of course there will always be the odd exception.
Addison's Disease
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Our 6 yr old rescued "Basenji mix", Curly Sue, was recently and surprisingly diagnosed with Addison's Disease. We have it under control now, but she takes prednisone every day and a shot every 3 weeks. Is this known in Basenjis or just a fluke?
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There are some indications of hereditary factor,s but all dogs, including mixes, can have it. Good luck on Curly Sue staying healthy and having it found early.
This is a good support and info site: