Flaxseed and other plants can provide one kind but fish (
particularly cold water fish) can provide a different, more beneficial kind (read more here).
Not exact matches
Cold -
water fish such as salmon are
particularly rich in omega - 3's because they feed on plankton that manufacture the fatty acids, but the most sophisticated animal that can make its own omega - 3's is the worm Caenorhabditis elegans.
(ref) So a krill or
cold water fish oil supplement, marketed for humans, might be a helpful addition to your pet's diet as well -
particularly if its bile acid test results are high.
Wild
fish,
particularly those caught in
colder waters, are an excellent source of protein and omega - 3 fatty acids.