Give 1mg of Benadryl per pound such that if your dog weighs 30 pounds, you should give it 30 mg of Benadryl. Talk your veterinarian - while antihistamines are generally safe, there are the potential for side effects particularly if your dog has chronic organ failure (renal failure, liver failure, congestive heart failure, etc.).
1 Encephalitis is inflammation of the brain. 2  Meningitis is inflammation of the membranes (called meninges) that surround the brain and spinal cord.  Both encephalitis and meningitis can be caused by bacteria or viruses, and rarely a fungus, or be noninfectious.
Encephalitis means inflammation of the brain, and it may be accompanied by inflammation of the spinal cord (myelitis) and/or inflammation of the membranes that cover the brain and spinal cord (meningitis) The disease is either the result of an infectious agent or it is termed âidiopathic,â meaning the cause is not known.