Watermelon seeds are potentially toxic to dogs if consumed in high quantities. A few seeds accidentally consumed by a large dog are not dangerous, but puppies and small dogs should avoid them entirely.
The rind may cause diarrhea and is a potential choking hazard. The pigments in the rind may cause a dog to pass green stool. This is not a sign of sickness, but it may be alarming,
It is always best to give a dog small amounts of watermelon at first to be certain that there are no adverse reactions.Learn more about Dogs