Kefir water is great for gut health
Packed full of natural probiotics. This is essential for dogs who suffer from upset tummies. It can help to heal their gut without use off lots of confusing supplements.
This product contains 98 million lactobacillus trains in 1 mL, which is a lot more than many commercial probiotics contain. the daily feeding amount is 50 to 100 mL a day.
Once opened this last for seven days, but you can always freeze for longer use!!
Quite similar to kefir milk or yougurt, which is often they go to for pets. This product is more suitable due to the lack of lactose! Unfortunately, some dogs are quite sensitive to the milk or yoghurt base
It can also be really helpful for those feeding kibble. Not only will you be adding additional probiotics into your dogs diet which is much needed on a highly processed food. It’s also excellent for hydration. 
Instead of soaking your kibble in water, soak it in this!
As for how often to feed it, it’s entirely up to you! 
Some dogs might need extra support so feeling daily would be a good option and others might prefer it added in a few times a month 
But it’s definitely something I would be adding into every dogs diet!