Bifidobacterium longum: Longum is the next gram-positive probiotic that is commonly found in the intestines. The researchers discovered that dogs who were required to take B. longum orally had lower Dog Atopic Dermatitis Extent and Severity Index scores at four, eight, and twelve weeks. Even though the study's sample size was small, this was the case. Even though there was no significant difference in transepidermal water loss, pruritus, or drug dosage with this strain, they concluded that B. longum could be considered for the treatment of severe skin symptoms associated with AD.