Tiger, dog and cat are placed in the order

The correct answer is carnivora.

To understand why tiger, dog, and cat are grouped together in the order Carnivora, we can look at their biological classification (taxonomy):

1. Kingdom: Animalia (All are multicellular, eukaryotic organisms)
2. Phylum: Chordata (All possess a notochord/spinal cord)
3. Class: Mammalia (All are warm-blooded vertebrates with hair/fur and mammary glands)
4. Order: Carnivora (All are specialized meat-eating mammals with teeth adapted for tearing flesh, such as canines and carnassial teeth)

Let's evaluate the options provided:
- primata: This is the order containing humans, apes, and monkeys, which is incorrect.
- carnivora: This is the correct order that groups tigers (Felidae), dogs (Canidae), and cats (Felidae) together based on their shared carnivorous evolutionary adaptations.
- mammalia: This is the taxonomic Class, not the Order.
- chordata: This is the taxonomic Phylum, not the Order.

Therefore, the specific taxonomic order in which tigers, dogs, and cats are placed is Carnivora.