[crazy4cats]

I was going by this that was posted in the Whole Dog Journal:
Here are my sardine recommendations for adult dogs. Feed twice this much to puppies and pregnant or lactating females.

Dog’s 3.75-oz can
Weight sardines
5 lbs 1/4 can per week
15 lbs 1/2 can per week
25 lbs 5/8 can per week
50 lbs 1 can per week
100 lbs 1 3/4 cans per week

A 3.75-ounce can of sardines has about 200 calories, so reduce the amount of dry food given on “sardine days” accordingly. Rule of thumb: One can of sardines in water has about the same number of calories as ½ cup of most dog foods.

You can substitute canned wild Alaska pink salmon (the bones are edible), oysters (a great source of zinc, especially important for pregnant and lactating females), and other fresh, frozen, or canned wild ocean fish for sardines. Pacific oysters are probably better than Gulf of Mexico oysters, especially after the BP oil spill in 2010, and safer than canned oysters from China. Never feed raw salmon or trout, especially Pacific salmon, because it may contain a bacterium that can kill dogs.
But…. now, I’ve pulled up my ABC diet and it does show two cans per week. So how about 1 1/2! LOL!

Here is the link to the whole dog journal: http://www.whole-dog-journal.com/issues/15_12/features/Fats-Chance_20658-1.html

Either way, it is great that you are considering adding them to your dog’s food. Good luck!