100mg or less should be good.
Also Yes on what
@Kaiser2016 mentioned about actual Chicken Broth containing onion. But I've never seen Chicken Broth listed on Chicken package. Just the Salt mg's. Would have to do some further investigation on that.
Also a Rotational diet of different meat proteins is best. Different meat proteins have different levels of vitamins, amino acids and enzymes.
We shop at Costco and I saw Organic Chicken Broth. I said Awesome for the dogs. But looking at the ingredients it contained Onion!! Then I said
. But I bought it anyway and I had bowls of it in the winter time. Or make chicken gravy with it.
Chicken and Beef Bone Broths are great for sick or healthy pets. Primal Pet foods makes Organic ones. Or make your own. It just takes about 24hrs. Just try and use Grass feed cow bones, Organic Apple Cider Vinegar, Organic Veggies and filtered water. Also same with chicken bones. Chickens that are farmed free range or feed with Organic feed.
About Probiotic's.
You shouldn't need any with raw feeding.
The raw meat has enzymes in it. Also Tripe is good to give.
We give Answers Pet Foods Raw Goats Milk or Fermented Cow Kefir which has lots of enzymes and probiotics in them. But our Boy has been on Prescription Heart Meds for over 3 1/2 years. He has bouts of diarrhea from any of the meds and all the supplements we give.
Now if the dog has other digestive issues like diarrhea or is getting Antibiotics. Then I would add a Pre Biotic and Probiotic besides the Goats milk or the Fermented raw cow kefir.