Yes we use Bragg's Apple Cider Vinegar. I add 1 Tbsp. to their drinking water everyday, I have done this since they were 10 weeks old, so they are used to it. They don't know their water any way else. (For those who's dogs don't like the smell or the taste of the ACV, you can also add it to their kibble.). I give it to them for preventative reasons, there are so many positive health benefits to ACV, such as its a natural anti inflammatory, ( 99% of all diseases including Arthritis is caused by inflammation in the body), it kills the bad bacteria in the body so boosts the immune system, which is beneficial for fighting infections, parasites, and allergy symptoms ( allergies are caused by an abnormal response of the immune system), and it also balances the Ph levels of the blood. Blossom has so many allergies to chicken, salmon, and her new one beef, corn and grains, so I hope being proactive and giving her ACV, Probiotics, and good quality food will help her to boost her immune system and fight the allergy symptoms. A strong immune system will also help fight infections, parasites, and bladder infections from the Inside. I haven't had any negative reactions to them having ACV. I also like the fact that these supplements are natural instead of medications, and they are also cheap to use, ACV costs $9.99 a bottle,I buy it at Nutrition House, yogurt is about $5.00 at Costco, and Coconut Oil is about $20.00 for a big container at Costco as well.