Hi My dog is very aggressive I can't even take him out when childrens are playing

Generally dogs become aggressive due to lack of proper socialization since puppyhood or due to confinement or lack of proper training . For an adult male dog you can get help from professional dog training services from Kuddle. Some calming medications with CBD oil,hemp oil, ashwagandha are available in market but you should not administer them without consulting a vet for proper dosage.