Food safety
Can dogs eat cooked beetroot?
Yes — fine in small amounts
Plain cooked beetroot is fine in small amounts — not the pickled kind.
How much
A small piece
Being honest about this
Dogs differ, and amount matters — a crumb of something rich is not the same as half a packet. Treats of any kind should stay under a tenth of what your dog eats in a day. If you're unsure, your vet would far rather take the call.