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Hello, my name is***** and I'm happy to help. Vomiting thick saliva can have multiple causes, including upset tummy (eating something she shouldn't, new food or treats, intestinal parasites). I would start with no food for 12 hours to rest the stomach, give over the counter famotidine (Pepcid) by mouth every 12 hours to reduce stomach acid. If the vomiting continues, then she needs to see a veterinarian for a thorough hands on physical exam. They may want to run a stool sample to check for intestinal parasites (tapeworms are common when they have had fleas).
If she has truly lost 15 pounds, she needs to see a veterinarian immediately.
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