so I am on a work trip out of town and my shelties are staying with my friend. she emailed me last night that Cranberry didn't finish his dinner and seemed out of sorts- just laying around. she gave him a Cerenia to settle his tummy and they all went to bed. This morning, she said he didn't seem any better so they headed off to the ER. other dogs are there with similar symptoms. He's been examined and has ulcers on his tongue and the back of his throat- the ER vet is not sure why yet. He's being kept overnight on an IV but wondered if anyone knew what might cause this or have had prior experience with similar situation?