If the dog vomits yellow mucus, you need to fast and deprive it of water first, then feed some probiotics, and then observe the dog's condition. If the dog does not improve, or has vomiting, diarrhea, poor energy, loss of appetite, etc., It needs to be sent to a pet hospital for examination and treatment to avoid delaying the condition.
Tip:
Generally, canine distemper and parvovirus are more likely to cause dogs to vomit yellow mucus, and there will also be other complications. If not treated in time, it is easy to cause Dog dies.