For dogs: Improves skin and coat health (less dryness/itching, more glossiness).
poochandmutt.co.uk
+2
Redbarn Pet Products
+2
Anti-inflammatory effects: Helpful for joint health (e.g., older pets with arthritis) and may support general inflammation reduction.
mypetnutritionist.com
+2
petmd.com
+2
Heart, kidney, and general system support: In cats especially, fish oils (and by extension good salmon oils) have been shown to help slow kidney disease progression, support heart rhythm, etc.
petmd.com
+2
Animal Medical Center of Chicago
+2
Brain / eye development & ageing: Particularly in kittens/puppies or senior pets, DHA (one of the omega-3s in salmon oil) helps cognitive/eye health.