'A lady correspondent writing from Surrey... draws my attention to two American publications dealing with the feeding of dogs. One, entitled "A Biuological Analysis of Commercial Dog Foods," makes a vigorous onslaught upon hte proprietary dog foods sold in America. Here is an extract from what the author (J.W. Patton) states:-

A considerable number of proprietary dog foods have been tested on rats for their biological value. In most cases they were found to be deficient in some essential food factor required for growth or reproduction, and the author considers that many of the dog foods now on the market do little more than provide maintenance requirements.

[NB: this passage is not present in article cited - it constitutes a summary of the experiment presented within it and its conclusions]

...

Fortunately for the United Kingdom we have been making great strides of late years in the improvements of our methods of feeding. The great biscuit-making firms have at length come to realise that the whole wheatmeal type of biscuit is the one containing vitamins in the highest state of perfection. This is largely due to the action taken by the veterinary profession in insisting upon the use of wholemeal flour instead of the white flour previously used. It is simply a repetition of what the medical profession have done in regard to the dieting of humans.'