To begin with, acorns contain a substance known as gallotannin. This can drastically harm your dog's health. It can occasionally be lethal. Third, if your dog consumes an excessive number of acorns, it may create a blockage in his digestive tract. This could be fatal. Gallotannin is toxic to dogs. Even in small amounts, it can cause vomiting, diarrhea, abdominal pain, fever, and blood in the urine or stools. If you find any acorns in your dog's environment, remove them immediately so he does not eat them. You can crush or soak the acorns before giving them to him. Acorn allergies are becoming more common. The nuts themselves don't usually cause problems for most dogs, but they can lead to an allergic reaction if they get into the ground state. This happens when animals chew on trees or bushes and then swallow the nut fragments. As they digest the nuts, they release chemicals that trigger an immune response in sensitive individuals. Dogs who are prone to allergies should not be allowed to run free in parks or wooded areas where acorns are commonly found because they could have their own unpleasant experience with this tree fruit.