State the type of interaction that exists between ticks and dogs.

Explanation

### Step-by-Step Solution

1. **Identify the Organisms**: The question involves two organisms: ticks and dogs.

2. **Understand the Nature of Interaction**: In nature, organisms interact in various ways. We need to determine the specific type of interaction between ticks and dogs.

3. **Define Parasitism**: Parasitism is a type of interaction where one organism (the parasite) benefits at the expense of another organism (the host). In this case, the parasite is the tick, and the host is the dog.

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