I got this from my vet a few months ago and found it helpful. For the weight under lbs, it's the weight you want them to be at. My guys are actually needing to lose weight so we're adjusting accordingly. It has a formula to adjust for activity on it as well.
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Duke (Birthday May 31, 2012)
Charlie (Gotcha Day March 10, 2014)
Rocky (Gotcha Day October 21, 2018)