I would say keep your dog from eating them.
Some info from some other sites:
Acorns can be very toxic in quantity. The tannic acid, and other contents
I'm not sure of, can be very hard on the kidneys. The've been known to
kill cattle with prolong consumption.
Acorns can also cause a bowel obstruction.
http://www.caf.wvu.edu/~forage/acorns/acorns.htm
Some info from some other sites:
Acorns can be very toxic in quantity. The tannic acid, and other contents
I'm not sure of, can be very hard on the kidneys. The've been known to
kill cattle with prolong consumption.
Acorns can also cause a bowel obstruction.
http://www.caf.wvu.edu/~forage/acorns/acorns.htm