The DNA of cats and dogs is more similar to the DNA of cats and hamsters because of the difference in their order.
According to taxonomic hierarchical classification, organisms are classified into seven different levels: Kingdom - Phylum - Class - Order - Family - Genus - Species. The more common level of classification, the more chances of similarities in the DNA patterns.
Three of the above animals have evolved from a single class,i.e., Mammalia. This means that all of them are mammals. But as evolution took place further, they got divided into two different orders. Cats and dogs went with the order of Carnivora while hamsters went with the order of Rodentia.
The cats and dogs belong to the same order while the hamster belongs to a different order. This means that the cats and dogs, thus, share a more common ancestor. They are more likely to possess more similar patterns of DNA than the hamster. It is because of this difference that the two categories possess a large difference in their DNA.
To know more about the DNA patterns of cats and dogs, refer to the following link:
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