Is fish oil bad for schnauzers?

No, fish oil isn't bad for schnauzers. However, moderation is key. Because fish oil is high in omega-3 fatty acids, consuming too much can lead to side effects such as diarrhea, stomach upset, and increased bleeding. For this reason, dog owners should be careful about how much fish oil they give their dog. In general, it's recommended that dogs be given 20mg of EPA and DHA combined for every pound of body weight daily.