Answer:
The population of deers and dogs would go down.
Step-by-step explanation:
If dogs could only eat deer plus the other animals that eat deer, then more deer would be hunted causing the population to go down. But since the dogs have to hunt and kill the deer themselves and they don't live near deer or they are bad at hunting, then the population of dogs would go down as well. Hope this helps and that is what you were asking for.