I don't know if you guys know this, but if you're dog is dehydrated (I'm assuming this is the reason for pedialyte) and having trouble holding water down there is something else you can do. My puppy, Drellie, was extremely dehydrated about 2 months ago. She was throwing up and had diarrhea and wouldn't eat or drink anything. The vet suggested she may have parvo. I had taken her to the vet on Friday morning and the vet told me to bring her back on Saturday if there was no improvement. By Friday evening, Drellie was comatose. She wouldn't even lift her head when I walked into the room. My mother told a friend of hers who called me and told me to get a nose syringe (used to suck snot from babies) or baby enema and fill it with water. Then you squirt that in the dogs rear. I thought that it would cause my dog to have diarrhea, but my friend told me that the colon absorbs water fastest. Well, I gave my baby her first dose at 11:30 pm. She didn't budge, struggle or move. 15 minutes later she got the second dose and she was struggling. I continued giving her 1 or 2 doses every hour and by 5:30 am, she was up and walking around. She was eating and holding food down by 2:00 pm and back on the road to health. I have no doubt that rehydrating her in that way saved her life.
BTW, my friend's mother is a quaker and will not go to doctors. When her mother was dying, my friend did the same thing to her and saved her life, as well.