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					Originally Posted by  tokipoki     I would not consider a 6 y/o yorkie a senior...I think smaller breed dogs aren't considered seniors until they are around 10?...not 100% certain though.   |  
 
  For vet checks, 7 - 8 years old is considered senior.   
For food, I don't think I would ever use a senior formula.   
For weight loss, simply decrease the amount as Tokipoki suggested.  Like humans, dogs need less as they grow older.  Activity level is an important factor at all ages.