Short answer
Yes, the risk comes from what's mixed into the acai bowl, not the berry itself. Common toppings like chocolate, grapes, or sweeteners containing xylitol are highly toxic to dogs. Even a small amount of xylitol can cause a life-threatening drop in blood sugar. Watch for signs like vomiting, lethargy, stumbling, or seizures in the next few hours. If you know any dangerous ingredients were in the bowl, or if your dog shows any unusual signs, call your vet right away.
Acai berry — Food safety facts
Feed with care · Dogs · full breakdown on the linked food page
Not toxic itself, but acai bowls are loaded with sugar and often topped with xylitol or chocolate.
The full verdict, portion guidance and serving notes are collected on the Acai berry food facts page.