Thanks Criminal for the posts. We lived on the head waters of the Missouri river outside of Helena MT. I owned a rather large brown dog at the time called Picus. My mother saw Picus swimming across the channel of the river and ran down to the riverbank to call him back. Picus just kept swimming to the other side ignoring my mothers pleas to come back. As Picus emerged from the river, my mother got the shock of her life as Picus had grown into a full size adult Grizzley Bear.
We took photos, I wish I could share but havent located them in some time. The photos would also reveal that the Grizzly had swam to a small beach that jutted out from a straight faced bluff over 300' in hieght and the only return path would be back to our side of the river, which the Grizzy did, but much further down stream then where we were at.