What happens if a dog eats raw vegetables?

Raw vegetables are usually fine but note these. First, fiber aids digestion but excess causes diarrhea. Second, they may carry bacteria and parasites like salmonella and toxoplasma, causing gastroenteritis, so wash them first.

Also, some have antinutrients like oxalates affecting absorption, so don’t overfeed. Finally, onions, scallions and raw garlic are toxic—see a vet if eaten in quantity.