Probiotics are beneficial bacteria like Acidophilus Bacillus coagulans or Bifidus spp. that work with the micro flora, i.e. “good” bacteria, living in the gut. Together, they play critical roles in the breakdown and digestion of food and help in keeping bad bugs like E. coli in check. Dietary inclusion of probiotics in your pet’s diet promotes optimal health by:

Promoting healthy digestion

Reducing gastrointestinal discomforts

Maintaining a strong immune system

Helping to manage diarrhoea

Increasing assimilation of nutrients from dog's food.

I would suggest a supplement from Ample Nutrition named Complete Dog Prebiotic and Probiotic. You can find here at
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Probiotic For Dogs