When I was on another forum before,it seemed that a lot of people switched their dogs to Senior around age 7-8.A few did at age 6 for larger breeds. My dog definately started slowing down around age 7.She's 10 now

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I think active adult is like,young adult. Age 1-3, "regular"-4 to 5.But after the dog starts slowing down,a bit at a time,which is natural since they are getting elderly.
Thats what I THiNK anyway.Please someone correct me.I could benefit from this topic as well,since my dog is a senior =P