A ponder I know in the midwest had her grand-dog contract giardia and the vet
suspected it came from the pond.
Here is a web page
http://www.priory.com/vet/giardia.htm

That said, the watergardening labradors drink from the pond and the river and
have been fine for six years.
When this ponder asked for help I asked someone in the know and he suspected
the pond was overstocked and badly in need of cleaning. Also that a dog or cat
may have been using the pond as a potty.
In all my years on rec.ponds I think this is only the second time I've heard
someone think that their pond made their dog sick.


k30a