Final answer:
Cats and dogs are considered to be part of the same group at the family level in the taxonomic classification system.
Step-by-step explanation:
In the taxonomic classification system, cats and dogs are considered to be part of the same group at the family level. The taxonomic hierarchy from lower to higher levels is species, genus, family, order, class, phylum, kingdom, and domain. Cats and dogs belong to the same family Felidae, which includes all the different species of cats, such as lions, tigers, and domestic cats, and the family Canidae, which includes all the different species of dogs, such as wolves, foxes, and domestic dogs.