I advise you place the dog in the front so you can closely supervise his effort.
If he is in the back he can stop paddling at any time without you noticing.

: Hello everyone,

: I am trying to design a tandem kayak to use with my 90 lb. dog.(I am 170 lb.)
: The question is should the dog be in front or back? With him in back I
: would be very close to the center of the kayak and I can place the
: cockpits closer together. That seems like it would be the best location to
: control the boat. But someone has told me that I should be in back for
: better control. Any advice?
: Thanks,
: Fred Graus