Our website on Sideroxylon lanuginosum (Gum bumelia)) makes no mention of poisonous parts, but we can give you some previous Mr. Smarty Plants answers on plants poisonous to dogs that you can search - search for it on the scientific name, Sideroxylon lanuginosum .
Cornell University's Plants Poisonous to Livestock
University of Illinois' Plants Toxic to Animals
University of Pennsylvania's Poisonous Plants database
The fact that a plant doesn't appear on a toxic plant database doesn't guarantee that the plant is completely non-toxic. Have you also checked with your veterinarian?