My dog is hungry all the time and scavenges immediately after eating. I don’t know whether this is a health problem, greed or a leftover habit from her previous life as a stray. She has been wormed (Advocate and Drontal).
All three of the causes that you mention are possibilities, but it’s most likely that she simply enjoys eating: many dogs seem to be almost insatiable.
Get her checked by your vet to rule out a medical cause. The vet will also give you advice on whether she is the correct body weight and may suggest foods (eg higher fibre) that are more likely to make her feel satisfied.
For many dogs, feeding twice a day with smaller meals is more satisfying than a larger meal just once.
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