Is it preferable to have a non-veg pickle in emergency cases for tasty?

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One week back I went to my mother's place to see her. She gave me a a small pot of pickle while returning to my place. Pickle means, it is not prepared with veg items like mango, tomato, neem itc.. It has been prepared by using with some of chicken pieces. I tasted it there itself with a plain chapathi. Really it was very tasty to eat with rice or chapathi. But i heard somewhere that eating pickle is not healthier for our body! Is it true or not?.... Shall i continue it to have with my meals?... What are the demerits of using a non-veg pickle?... How long shall i use it to preserve?.... What are the best pickles to keep with my dining table always!