Using the Example of docker Whalesy

docker/whalesy:latest not found error

Looks like a typo perhaps? should be:
docker run docker/whalesay cowsay boo

ok thanks I will try it again

so I pulled the image I created a directory on my machine creater a docker
file and issued this command

docker build -t docker-whale .
Sending build context to Docker daemon 2.048 kB
Step 1 : FROM docker/whalesy:latest
Pulling repository
Error: image docker/whalesy:latest not found

thanks got it to work appreciate