Big kibble for small dogs may be easy palatability boost

Small dogs actually preferred large kibble pieces in an experiment conducted by AFB scientists.

January 30, 2019

By: Tim Wall


Without expensive research facilities, small dog food companies lack access to data on the sometimes-counterintuitive results of pet food palatability experiments, said Kristopher Figge, senior technical sales and service representative for AFB International,  in a video from Petfood Forum 2018 (below).

For example, small dogs actually preferred large kibble pieces in an experiment conducted by AFB scientists.

“A lot of the big companies, that’s intellectual property for them, so they don’t share that type of information,” he said. “It’s good information to share to the industry. AFB, we don’t make dog food, we make palatability enhancers for the cat and the dog food, but we have the equipment and the resources to give that data, to present that data, to the small pet food guys that maybe don’t have a large research and development group.

“That’s data that they can take and use right away,” Figge said. “It’s not expensive. By simply modifying some equipment, it’s really an easy switch to  make that next palatability jump.”

“It’s important because most people think, whether it’s an urban legend, urban myth, that small dogs prefer small kibble.”

His experiment revealed that it may not be the size of the larger kibble, but instead the texture and smell of those dog food pieces that enticed dogs of all sizes.

Experiment observing dog food kibble size preferences

Figge developed the idea for this kibble-size research serendipitously. One day, he gave his small family dog a kibble variety meant for larger dogs. He observed that the dog, which weighed less than 30 pounds, readily devoured the large pieces and seemed to enjoy it.

This surprised Figge, so he decided to test the observation empirically. His research team originally hypothesized that smaller dogs would prefer smaller kibble. Dog foods marketed for small breed tend to have relatively smaller kibble sizes than standard varieties, but it seems humans may have just assumed this was what little dogs would prefer.

In the experiment, a standard formulation was extruded in three different sizes. Small kibble ranged from seven to eight millimeters, medium from 11 to 12 millimeters and large from 15 to 16 millimeters. The 40 dogs in the palatability trial also ranged in size with small dogs being less that 30 pounds, mid-size dogs from 30 pounds to 54 pounds, and big dogs weighing 54 pounds and up.

Analysis of kibble chemical and physical properties

The kibble pieces were evaluated for texture, aroma and taste. The larger kibble pieces proved to have the highest texture scores on the various probe instruments used by the AFB International researchers. Previous studies found evidence that dogs tend to prefer hard diets to soft diets and that texture influences palatability.

Figge’s team used electronic noses and tongues to evaluate how dogs would perceive the kibbles’ taste and smell. While these sensors can’t determine good versus bad flavors or smells, the devices can detect differences. The large kibble proved to be different from the small and medium sizes, while those two sizes varied little from each other.

The researchers used other devices to measure the volatile chemicals emanating from the three kibble sizes. Uncoated large kibble had 23 percent more parts per billion of total volatile molecules than small kibble and 13 percent more than medium kibble. Coated large kibble released the highest levels of volatile flavor compounds. What this means is that large kibble released more aromas that attract dogs to their food.

Considering the importance of smell in a dog’s diet preferences, AFB Internationals’ researchers may have revealed that dogs’ noses trump their mouth sizes when selecting foods. Pet food manufacturers may be able to apply this research to their new product development, Figge said. However, it will fall to the marketing department to convince customers that their Chihuahua can enjoy Great Dane sized kibble.

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