Apple cider vinegar is one of the most widely recommended natural remedies for pets online. But does the evidence support the claims?
Common Claims
- Repels fleas and ticks
- Treats ear infections
- Improves digestion
- Acts as an antibiotic
- Prevents UTIs
What the Evidence Actually Says
The scientific evidence for ACV in pets is extremely limited. Most claims are anecdotal. Studies on flea repellency show it does not effectively repel fleas. There is no evidence it treats ear infections or UTIs.
Potential Risks
- High acidity can damage enamel and irritate mucous membranes
- Application to broken skin is painful and can worsen conditions
- In cats: should be used with extreme caution — cats are sensitive to acids
- Never use undiluted in or near ears
When ACV Might Help
Diluted ACV (1:1 with water) applied to healthy ear flaps may have mild antimicrobial properties. This is the most evidence-adjacent use.
Conclusion
ACV is not harmful in very small diluted amounts, but the dramatic claims made online are unsupported by evidence. For actual health concerns, veterinary advice is always more reliable.