Have anyone with a black dog notice a change in colour i.e. slightly reddish colour in the coat using a hydro pool even if you rise and shampoo afterwards.

I can honestly say no in this circumstance. I've taken 3 black dogs and none have changed coat colour, be it long or short coated.. Me and the little one are off for a swim this morning for a bit of fun!

If they chlorinate the water then it woudl bleach the coat.

My black dog has had no fade in coat. The pool we use used to use bromine but now uses chlorine. There has been no difference in his coat at all with either chemical.

Thanks for that.