it depends I would say about 5009 because there are always
different amounts of raisins in raisin bran. There if no exact
number because if you count them in one box there is a high chance
it will be different in another box :)
Raisins and grapes can cause liver damage, which can be fatal.
There is no outward indication of which dogs are susceptible to
this, nor how many raisins or grapes it will take to cause the
liver failure. For this reason, you should not give any dog any
raisins or grapes.