This usually indicates that there is a build-up of waste matter in the dog's system. The vomiting or diarrhoea is a way of discharging this waste thus helping to cleanse the system for a time. There is probably some sub-clinical disease present.
This pattern of behaviour is usually associated with feeding low-quality pet food and a change to a decent feeding regime will usually solve the problem. Many owners find that the dog (or cat) habitually vomits in the mornings. The owner may be advised to feed frequently.
This is often successful in stopping the vomiting but it is not good practice because this is only keeping the lid on the problem, not curing it.
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