There are several possible causes:
Most obviously, you need to check that the dog is being fed enough for its weight (assuming that it's not overweight and needing to diet). Weigh the dog and check on the dog food pack/tin that the amount you are giving is sufficient.
The dog may have worms; they live in the dog's gut and use up a significant proportion of the dog's food intake. Regular worming tablets will prevent this.
It's common for spayed bitches to be constantly hungry, in which case it may be worth getting veterinary advice about foods that help with this, without creating an overweight dog.
It's also possible that the dog has simply been allowed to get into bad habits - if you regularly feed it scraps even after it's been fed with its own food, it will learn to expect that food every meal time. Getting the dog out of that will require consistent retraining.
Failing any of the above, it may be worth a trip to the vet to rule out more serious (but MUCH less common) causes.
because its hungry
The eagle was hungry.
If the dog has only missed one or two meals it may not be a big deal as long as it is still taking water. Sometimes a dog will stop eating for a day or two if there is a female in heat near by. Generally after a day or two the dog will be hungry and eat again. If this persists more than two days or the dog is behaving as though something is wrong it should be taken to the vet.
Yes They're Hungry they will eat it
The dog might not be receiving enough food for its weight/size and is still hungry. If a second feeding or larger portion still does not satisfy the dog, it should be checked and possibly treated for a worm infestation.
Most dog does not like to be disturbed when they are eating. Your dog must be very hungry or very protective about his of her food.
no it depends... if your dog is old its probably not hungry...if your dog is younger you should take it to the vet after a couple days of her/him not eating
maybe his hungry, or he feel very lonely
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No, it will not. It will be hungry, but not that hungry. That being said, no dog should be left for days without food and water. In most places that would violate animal abuse laws, and in any case it is inhumane.
the male will most likely leave her alone and if he tries it doesnt matter because a female can not get pregnant unless she is in heat
YES ... they can ...