I think my dog is dying ?

my dog well he is a Rottweiler and I think he is gettig around that time becausr he is usually barking at everything or walking around but I left my dog outside last night in my yard ( he is a outside dog but forgot to put him in his house) the next morning around 8 I hear him breathing really loud so I went out there to make sure he ain't choking but I find him laying there breathing hard and his heart pounding .slobbering all over but I mean he was drooling a lot his legs were dripping and same with his mouth so I let him loose get him fresh water but for the whole afternoon he didn't move just laid there the drooling stopped but now its like he can't move he just looks at me the last couple of days he hasn't been eating at all just drinking water my parents say we can't take to the vet cause we can't afford it but I can't just leave him there after him being with me for about 7 years I can't leave him suffering please any suggestions I'm trying to see to borrow some money to take him to the vet but no luck yet anything will help sorry for the long question. If you need more info that I forgot to say let me know just want to get this question out quick