Hey /an/ I think my dog is really sick and she keeps throwing up a thick siliva substance and I can't take her anywhere because I don't have a car and I'm home alone. I think I might have to put her down soon /an/
She is currently resting and breathing a little faster than normal
Pic related it's her
Is she eating and drinking at all? Could be blood mixed in the vomit, which could account for the thickness,or food, depending on its color. You should try and call someone, get them to take you to the vet ASAP. Also, call the vet and let them know what's going on, ask questions, etc.
Dunno about your area, but some vets around my area will work with you if you're strapped for cash. (payment plans and such). If there's nothing you can do, you'll have to wait and hope she is ok.