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I am surprised the ER vet did not do any x rays. Whenever a dog eats a non food item there is a risk of a blockage. This will show vomiting, sudden lack of appetite, diarrhea , sometimes bloody, and lethargy
It sounds like the vet treated for an allergy with the Benadryl and for the diarrhea. Did they know the dog ate a rawhide?
Here is more on obstruction of the bowel . It will tell you symptoms and treatments
I am going to direct you to a site that will tell you how to take the vital signs of a dog which will help you in your decision to seek help now or if it can wait until tomorrow. The gum color and capillary refill time are important, as is the temperature. You can use any thermometer you have available, it does not have not be a rectal one.
What is normal in dogs http://www.petplace.com/dogs/what-is-normal-in-dogs/page1.aspx
This breed is also prone to Pancreatitis which would show all the same signs of a blockage. If the dog has eaten anything out of the ordinary in human food then that could cause a problem as well.