Dog Catalog Prints

Hi I found these cool Dog prints at a local shop.
Can anyone tell me more about them?
From my limited research, Walter Fletcher was a journalist/writer who covered dog shows. RV Denenberg & Eric Seidman- I'm not sure if they are the artist? The posters are signed and dated 1977 but can't tell the signature.
I think Denenberg & Seidman might have written books, but I do not see anything regarding Dog Catalog Posters/Prints.
If anyone has any information on these- it would be greatly appreciated.
THANK YOU!