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Hi, Welcome to Just Answer. I'm Chris, a small animal Vet based in the UK. I am reviewing your question and will get back to you as soon as possible
Sorry to hear this - any vomiting? Could he have eaten anything he shouldn't have? Is he able to eat/drink normally? Excess salivation is usually a sign of nausea in dogs, although it can also be associated with something stuck in the mouth. Are you able to have a look in his mouth?
You're welcome, probably safest to get her checked over.