There's an excellent report available with the results of a study on the health of senior dogs, certain conditions and the breeds most at risk for them, as well as prevention and management. It's worth wading through. Senior Shelties are definied as 8 1/2 years old and top the list for the most at-risk breed for kidney disease. Here is the link for the cover information and one for the report. This is Part 1; Part 2 will be published in the fall.