Quote Originally Posted by Tthree View Post
That is 25% of the first dog year. People like to use 7 years as a dog year but in fact the first dog year is 12 years and the rest of them are 4 years. 7 years is somewhat of a lame average of the two figures. Year by year the average changes: 12 years, 8 years, 6.67 years, 6 years, 5.6 years, 5.33 years, 5.15 years, 5 years etc.

OK, Tthree, I'll bite!!

Why is the first dog year equivalent to 12 human years; and the rest, 4 years? Is it comparing to human capabilities? mammalian capabilities? Just curious.