
It is almost impossible t0 tell age past about 18 months (when they still have those lovely peraly new teeth). Soem dogs age faster than others and some will ahve poor teeth due to bad nutriotion, and a dog that chewed a lot due to hunger or boredom could have very worn teeth at quite a young age.
Also generally dobermanns age faster than a small or medium size dog.
The amount of frosting is irelevenat as some get this at a year old and some show no grey for years.