With extreme caution dogs can eat certain parts of a Jicama plant. Some parts of the plant are toxic to dogs while other parts are fine in small quantities.
Toxic – the above-ground leaves and seeds are toxic to dogs.
Safe – the peeled bulb/root/flesh is safe in small quantities for dogs on rare occasion. Whether it be cooked or raw.
If you are unsure of what parts of this plant are safe for your dog to eat the best option is to avoid feeding this vegetable to your dog all together. It is better to be safe than sorry when it comes to your dogs health.