Pig ears are highly nutritious, but they should always be given as a treat rather than as part of a routine diet. Two reasons for this are...
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If given excessively, they may contribute to obesity. However, some fat is a good thing, as dogs need up to 20% of their diet to be made up of fats.
In addition to fat, the other nutrient that is found in pig ears is protein... almost 70% of a pig's ear is protein! 
Protein is made up of amino acids, which are the building blocks of all structural parts of the body, such as muscles, enzymes and antibodies. They are essential for basic functions in life, as well as effective immunity.





Pigs ears have a large hide content, they are tough to chew and require some effort to eat. However, they are not as tough as cow hide, and therefore do not cause excessive abrasion on the gums.
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The toughness is a good thing as the continuous chewing action will remove plaque and tartar from your dog’s teeth. So, the good news is giving occasional pig ear can aid in keeping the teeth clean and prevent dental disease.
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To summarise...

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