Re: Dog unrinating on kids bed.

The dog is asking for help.  Specifically she is informing the two
children that she has a urinary track infection which requires
antibiotics.

Of course the dog itself does not understand this however because the
dog is closest to the two children it is seeking help from them.

Take the dog to a veteranarian for the appropriate prescription.

The problem will stop within one week after treatment begins, the dog
will be cured after approximately two weeks.