We have Watermaid units on dolphin pools as well and we just installed a unit on a dog therapy pool and they are used on horse and people therapy pools. Sean is right; you need to check with a vet to see what kind of chlorine level they can tolerate. These are ocean otters not their landlocked cousins right? If they are the freshwater variety, I am sure that there will be different salt level requirements. Units can be calibrated to any salt level from 400 parts per million to saturation. Most manufacturers are happy to help out little furry critters so I am sure that whatever model you choose, you will get lots of help.

Mark Manning
Watermaid Canada
www.watermaid.ca
mark@watermaid.ca