The number of dog- and cat-owning households is increasing in the US [ 8 ], and at the same time there is an increasing trend in the “humanization” of pets and pet products [ 22 , 23 ].
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The number of dog- and cat-owning households is increasing in the US [ 8 ], and at the same time there is an increasing trend in the “humanization” of pets and pet products [ 22 , 23 ].