Help dogs coughing problem!?

Heres the deal I have a pitt that started hacking like a piece of gr was stuck in his throat. Then it changed to a different cough a softer just kind of huffing every now and then. So I thought he had gotten it out and maybe his throat was just sore now. He only did it a little today but heres the problem I have another liitle mixed dog that started coughing late last night starting with the hacking and now for the past couple of hours she will start coughing and then throw up. She just ate a little while ago and I think she has thrown all her food up. the last time she threw up it was just white and foamy. (This dog is known to get gr hung in her throat. I have taken her to the vet for the coughing before and they said it was gr give it a day or so. But she is throwing up now and the other dog is coughing too) Could they both just happen to have gr in their throat or something more serious. I cant afford to take them to the vet until friday. Thats the only reason they are not there now. If its something more serious then I will find a way to take them now. Thanks. Please help!!