Aw, that’s not right! :-(
If she wanted her estate to go to benefit dogs, then that is exactly what should have happened. To only give 1% or less of her money left behind to dog related charities is insulting to her wishes.
As far as those grandkids that were left out of the will, it is possible they were left out for a reason...
I find it disturbing that it is so easy to subvert any person’s will. Whatever is written must be respected.