Acai berry — Food safety facts
Feed with care · Cats · full breakdown on the linked food page
Not toxic itself, but acai bowls are loaded with sugar and often topped with xylitol or chocolate.
Short answer
The acai berry itself isn't toxic to cats, but the bowl is the real concern. Watch your cat for vomiting, diarrhea, or restlessness, especially if the bowl contained xylitol or chocolate. The dog is fine. Keep the bowl out of reach and call your vet if your cat shows any of those signs.