Short answer
They require more caution for a small dog. While a couple of dried berries aren't toxic, a tiny dog's lower body weight means even a small amount of sugar or potential medication interaction carries a proportionally higher risk. Watch closely for signs like vomiting, diarrhoea, or unusual thirst, which could indicate a problem. It's best to avoid giving them to very small dogs altogether, and if your little one eats several berries, keep an eye out and contact your vet if you notice any worrying changes.
Goji berry — Food safety facts
Feed with care · Dogs · full breakdown on the linked food page
A couple of dried berries are not toxic, but they can interact with medication and are high in sugar.
The full verdict, portion guidance and serving notes are collected on the Goji berry food facts page.