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Ribos studies have been done in dogs and have proved beneficial in providing heart support, and helping with muscle soreness.However this has been known to lower the blood glucose levels in some dogs so this should not be started without the advice and proper dosing information from your vet.
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When using supplements it is always beneficial to consult with a holistic vet who will have more knowledge in this area then most general practioners.
I hope this has been helpful,please reply back if you have additional questions or concerns