This is an actual ad that appears in the June 97 issue of Dog Fancy:

Can Your Dog Read? While there is little scientific evidence, loving dog
owners believe that there are many amazing indications that some dogs may
be able to read or recognize words. Send now for your Dog Reading Fun Kit
with eye chart, flash cards, instructions and diploma. Hours of
entertainment for you and your loving companion. Order additional Dog
Reading Fun Kits for gifts. Mail your check or money order today! $7.95
plus $2 s/h for each fun kit to: MDA Products, 5339 Prospect Rd #280 San
Jose, CA 95129.