If your dog is a puppy that is less than or about 6 months old, it's easy to determine the age by the teeth. The "adult" incisors (the teeth at the very front of the jaw) begin to erupt at about 4 months of age. At 4 1/2 to 5 months of age the "adult" molars & premolars start to erupt. At 5 to 6 months of age, the "adult" canines (the sharp, pointy teeth) erupt.

If you have an older dog, an experienced eye (ie: a vet, vet tech) can make a "guesstimate" based on the condition of the teeth, the condition of the eyes (there are ocular changes that tend to occur with age), overall body condition, etc. With dogs >2 years of age, it is truly a guess, as it is unknown as to their 1) previous diet, 2) previous dental care, 3) health status (which can be assessed with a general blood work-up), and 4) disease exposure.

Dogs that have been on a poor diet, have a physiological condition (thyroid disorder, diabetes) or have been cared for poorly tend to "appear" older than they truly are...

Member 300693 answered on 10/10/08. Helpful? / 1

The only complaint I have with the chart is calculating older dogs. I have a Border Collie that is going to be 17 soon (Yes. Still happy and healthy. Runs and plays. Good eyes and hearing). The chart only goes up to 14.

Due's Gunnery Sergeant "Gunny" answered on 3/16/10. Helpful? / 1

Oh it's Easy. You Can Notice When Your Dog Matures.
Such as not wanting his toy anymore.

Omega answered on 7/6/10. Helpful? / 0