It depends on the type of thoughts it wants to plant.
Our conscious, rational brain relies on associations to attach meaning to things. Such abstractions are learned and therefore differ from person to person. When a physicist, a biologist, and a poet look at a flower, it's unlikely that they'll represent it the same way in their minds.
However, some thoughts build on instincts. Primal fears, hunger, sex drive, being tired or agitated, those function in a fairly uniform manner. Similarly, pain, sensor and motor functions, and so forth are simple enough that we know countless drugs to alter them.
So, I'd expect that there is a huge jump in difficulty between manipulating instincts, vague feelings, and body functions versus causing structured and rationally meaningful thoughts. For example, if you want to make someone think of a tree, you have to find the nodes and connections representing a tree in this specific person's head. And those might not at all be similar to trees in your head. It's going to get very complicated.
Then, it's important whether there is a conscious process between the manipulation and any intended effect. While "primitive" attacks like raising anxiety or making the target tired are straightforward, it is unreliable to trigger emotions to make someone do something specific. For example, the Mind-Wolf wants to keep someone out of a cave, so it plants fear. But the person happens to be afraid of open spaces and feel safe in caves! Suddenly, the person is eager to get inside, maybe even ready to fight the wolf to get inside! Without deep understanding of the target's thought process, such reactions can be quite unpredictable.
Consciousness is a somewhat debated concept. If I take it as a synonym for self-awareness – which not everyone would agree to be the same thing – it's usually placed somewhere around the reflective ability required to pass the mirror test. If you want to plant a targeted, meaningful thought in a healthy, educated human, I'd say you'll end up needing more than that: you need to understand who the other person is and what is relevant in that person's world of thoughts. Doesn't seem like an easy task for some animalistic machine.
To sum it up:
- If the Mind-Wolf just needs to wreak havoc, it doesn't have to be smart. Mess with the person's stress level/Sympathetic nervous system. Amplify whatever thoughts correlate with anxiety and irritation. Or just induce random errors in the target's attention/working memory. It will deal a lot of damage.
- If the Mind-Wolf wants to trigger an instinct, like making someone afraid, aroused, dizzy, careless, stunned, etc., that should be doable with reasonable effort too, and wouldn't be too different from the effects of certain drugs. I wouldn't want to rely on any results though, as people have different strategies of coping with impulses or feelings.
- In order to place specific thoughts or ideas, that are meaningful with respect to reality, the Mind-Wolf would have to understand what the neural network of its target means. That requires detailed understanding and is probably extremely difficult.