The ranking of these 4 breeds of dogs in descending order of intelligence is: 
1. Poodle 
2. German Shepherd 
3. Labrador Retriever 
4. Chihuahua
German Shepherd, Chihuahua, Labrador Retriever, Poodle
### Instruction:
Rank these 4 breeds of dogs by their intelligence in the descending order.

### Input:
German Shepherd, Chihuahua, Labrador Retriever, Poodle

### Response:
