my dog is constipated, drinking gallons of water but then throwing up only flem and water and although she doesn't appear to be in pain and is bright eyed. She is lethargic and her stomach appears spasm like. ( all in the last 12 hours) She has not eaten in 18 hours. She is due to go into kennels today for 2 weeks what can I do.........Update it has been 3.5 hours since I asked this question and have had no response, my dog is getting worse and I am going to the vets instead. Please refund my voucher.