Plageman, R. B. (1899). House dogs, their care and treatment. New York: S. C. Hodge
While not dog ads, strictly speaking, these are worth including:
Vintage Dog Ads
Plageman, R. B. (1899). House dogs, their care and treatment. New York: S. C. Hodge
Plageman, R. B. (1899). House dogs, their care and treatment. New York: S. C. Hodge
YesBiscuit! 
Paul Brown, the artist who drew the picture in the Brooks Brothers ad, was a prolific illustrator of books about horses.
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Thanks for letting us know Anne. I see he got a horse into the ad too. I’ll keep my eye out for more of his work.
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