TailVilleWhy
Barley tea is brewed from roasted barley, so it's caffeine-free, and some Korean owners give it instead of water. It has no known toxicity, but there's almost no research in pets. A few pets are allergic to barley, and strong brews can upset the stomach. Other grain teas like corn silk or cassia seed tea have different ingredients and need to be checked separately.
How to give it / if eaten
If you want to offer it, brew it weak with no sugar or additives, cool it and give just a little. Always provide fresh water separately and don't let barley tea become the main drink. Check labels on bottled barley tea.
Watch for these signs
Usually none, but a lot of strong tea may cause loose stool or vomiting. An allergic pet may get itchy.
FAQ
My pet doesn't drink much. Can I add barley tea?
Weak barley tea to spark interest is fine, but discuss low water intake with your vet. For cats, wet food or moving the water bowl can also help.
What about corn silk tea?
Corn silk tea is thought to be diuretic and there's little pet data. Skip it for pets with kidney or heart disease; there's no need to give it.
General information only. Weight, age and health conditions change how a pet reacts, so ask your vet if you are worried.