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A new pet food product for small dogs has been developed to help with tooth decay

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A new pet food product for small dogs has been developed to help with

tooth decay. Fifty-two dogs participate in the study. Each dog owner picks a card from a standard deck out of a hat. If the card is red, their dog will be in the treatment group. If the card is black, their dog will be in the placebo group. 
Which experimental design was used?

- Matched-Pair Design
-Case-Control Design
-Randomized Block Design
-Completely Randomized Design