E13 (below) is a 0-3 on the canine nerd level scale: it’s relevant whether you’re a pet professional or have no animals.
E11 (below) is a 1/3 on the canine nerd level scale.
E9 (below) is a 2/3 on the canine nerd level scale.
E7 (below) is of interest for levels 1, 2 and 3 on the canine nerd level scale.
E5 (below) is a 1.5/3 on the canine nerd level scale.
E3 (below) is a 2/3 on the canine nerd level scale.