I have a dog that has been vomiting off and on for 6 months. The vet treated him for worms and he is fine until the worming medicine is gone. Then he's vomiting again. Antibiotics and stomach pills are not helping. He had an elevated white blood count and his spleen is enlarged. The is now coughing and having a rough time breathing once in a while and is vomiting again. Mostly flem and water. He has ruined my new carpet and is bankrupting me with vet bills. Any suggestions?

Sorry I can't give you a personal answer as I have never had this problem...

Here is a site detailing causes and symptoms of enlarged spleens which ight be of use to you :)

Google Answers: Enlarged spleens in dogs- causes and treatments

There must be something in your environment that keeps making him sick.
.Maybe it is the new carpet as they are often treated with formaldehyde and any intake of formaldehyde is toxic.There is no safe use of it.Dog lays on carpet ,formaldehyde poisoning is a possibility.