Pigs have a body cavity completely lined with tissue derived from mesoderm tissue. This makes them coelomate.
Coelomate animals, also known as eucoelomates, have a body cavity called a coelom with a comprehensive lining renowned as peritoneum that is came from mesoderm, one of the three primary tissue layers.
Mollusks, annelids, arthropods, pogonophorans, apometamerans, tardigrades, etc. are protostome coelomates i.e., acoelomates and pseudocoelomates are also protostomes.
Chaetognaths, echinoderms, hemichordates, and chordates are all deuterostomes.
Thus, pigs are coelomates.
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