As Johnny and his son are humans, and humans walk on two legs, this means that between the two of them there are 2*2=<<2*2=4>>4 legs' worth of organisms.

There are two dogs walking along as well, and since dogs walk on 4 legs this means there are 2*4=<<2*4=8>>8 legs' worth of organisms.

We add these two totals together to find there are 4+8=<<4+8=12>>12 legs' worth of organisms in total.

# Answer

12
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Johnny is out walking his two dogs at night, and his son joins him for the walk.  How many legs' worth of organisms are traveling together for this walk?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
12
Johnny is out walking his two dogs at night, and his son joins him for the walk.  How many legs' worth of organisms are traveling together for this walk?
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