Do pigs use meiosis or mitosis?

Answer 1

Many organisms use mitosis and meiosis. Namely, all eukaryotes probably use mitosis and meiosis. Only bacteria (prokaryotes) would not divide by mitosis and have no mechanism for meiosis as their chromosomes differ from those of eukaryotes.
But eukaryotes all have the capacity for mitosis and meiosis. Eukaryotes include all animals, plants, protists and fungi.

Thus, since pigs are animals (and are thus eukaryotes), then indeed they have cells that divide by mitosis and meiosis. Their body cells (somatic cells) divide by mitosis (for growth and repair). Their gametes (sperm cells and ova) are produced by meiosis as these cells must be divided to a haploid form before copulation and fertilisation. Two haploid gametes would fuse (fertilisation) to restore the resulting cell (zygote) to a diploid form. The zygote grows into a new piglet via mitosis.

Answer 2

Pigs, like other animals, use both meiosis and mitosis in their life cycle. Meiosis is used for the production of gametes (sperm and egg cells), while mitosis is used for growth, tissue repair, and asexual reproduction.