My two are 8 and 9 in this picture (border collie is younger). I put one drop of 1% Iodine in their water every time I refill their 5-cup sized bowl. (They've had magnascentanddetoxified iodine.) I also add two shakes of realsalt from a table salt -shaker. They always get good reviews from vet who's amazed at how healthy they are. (She still pushed those darn heartworm pills, however.) No, thanks!!! 8^)