first off i want to thank you already DT. I am a new member here and already you have helped. I have read thing that have said some plants are dangerous to dogs, but never before have i seen grapes on the list.
we often give grapes to my two older male APBT's because it is funny to watch them throw them in the air out of shock that they are so slippery and slimey.
Recently my 8 month old started having a case of the squirts and we tried everything to find an answer. we even went as far as taking away his rawhide bones thinking that was his problem. upon reading your post i asked my vet, and we put 2 and 2 together. he developed a bad rash in his ear and like i said his poop wouldnt harden. the vet agreed that the grapes could be the problem.... pulled the grapes and shazzzam! Hard poop, nice pinkish ears again.
So if it means anything at all to you, you possibly saved the lives of 5 of my pets. not one my friend but 5. keep up the good work and i am forever in debt to you.

-B-