A universally recommended one seems to be Colostrum : the "liquid gold" that comes in before breast milk.
Why 'liquid gold'? Before the development of antibiotics, colostrum was the main source of immunoglobulins used to fight infections, such as polio.
So - for our foster dog we're currently looking to
a. reduce stress
b. boost his immunity
For now we've settled on Pet Natural's Calming Formula treats.
Active Ingredients Per 1/4 Teaspoon (1.25 ml):
Thiamine (Vitamin B1) . . . . . . .31.25 mg
L-Theanine (Suntheanine® brand) . .10.56 mg
Colostrum Calming Complex . . . . . 5.28 mg
A bit more about colostrum:
What is Colostrum?
Colostrum is the pre-milk fluid produced from the mother's mammary glands during the first 72 hours after birth. It provides life-supporting immune and growth factors that insure the health and vitality of the newborn.
Does Colostrum Help With Cuts And Burns? After Surgery Or Accidents?
Colostrum's immune factors are highly effective anti-bacterial and anti-viral agents to help reduce and eliminate infections in external injuries (cuts, burns, abrasions and surgical wounds). Colostrum also contains epithelial (skin) growth hormone that stimulates accelerated healing and powerful anti-inflammatory agents that can eliminate swelling and pain. Open the capsule and mix with sterile water or a saline solution to form a paste. This can be applied directly to the affected area. Bandage if needed. Reapply two to three times daily until healing is complete.
What About Pets?
Bovine Colostrum is not species specific and works wonderfully with cats and dogs and other mammals. Open capsules and sprinkle in pet dish...most pets love the taste of Colostrum. Encourage them to drink water along with it.