That's exactly what Rocky does. If he has a salt block and is locked in his pen, he just stands and licks and licks, which causes excessive drinking, which causese excessive peeing.
If I don't keep him locked up he doesn't do it. I know Pony isn't locked up, but I'd think it was from licking the salt block. But why is she doing that? Maybe and mineral/electrolyte imbalance??? Maybe try putting that loose mineral powder in her feed. It's good stuff. By Purina, 12-12-12. And get rid of the salt block. I was told give 2oz a day to each horse when I used it. With Rusty gone, I'm back to blocks for now. I've been watching to see if Rocky got obsessive about licking too.
That's what I'd try first.
Becky
Why did this suddenly start is my question too. At least it seems sudden. It used to be her habit to lick the block a bit after breakfast, but not spend the day there.
I think I'll call and ~ask~ the vet if he has any particular concern.... and then look for the loose mineral supplement at the feed store when we go.