My dog is 7 yrs old, and has the same symptoms you described, but other problems may be the cause. My dog has Hemorrhagic GastroEnteritis (HGE)
Veterinary Q & A - Hemorrhagic GastroEnteritis (HGE) in Dogs . She has had it for about 5 yrs. It can be fatal if left untreated. Your dog does need to see a vet ASAP (if you have not already seen one). The web site has most of the details regarding the treatment, but I would like to share something my vet told me. Not all vets know how to treat HGE. Some have given the blood transfusions, which can be fatal We follow the same treatment listed on the web site. We only feed her Royal Canin Low Fat, which is prescription. I understand your funds are low, so maybe you could buy some just for when your dog is showing signs of the illness (if HGE is the problem), but you would need to find some OTC low fat dog food. Absolutely NO TABLE food (ever)! After your vet treats your dog, if this should happen again, do not feed your dog for 24 hours (water only). You can give white rice with a little fat free chicken broth (for a day or so). Our vet suggested giving prilosec every day. I was shocked at the advice since daily use is not normally recommended for people, but it really does make a difference. I’ve checked with other vets, and they said it’s OK. We use an off brand to save money. We give fat free cheese for treats, and cook can dog food to make dog cookies. Cut the can food up in small slices, and then bake at 350 (two cans for 30 minutes, or 4 cans for 40 minutes). It smells bad while baking, but it’s worth the trouble. Good luck with your pet!