I found the following dialogue in a manga.

繋がれてる【つながれてる】からって

からかっちゃダメですって

My thinking is that the person speaking is describing what the dog is "saying", i.e. "I'm tied to this pole! Dont' ???"

Where the ??? is the meaning of the word/phrase からかっちゃ which I don't know how to parse. My only guess so far was that it is a contraction, からかっちゃ = からかっては.

Looking for more occurrences of the phrase I found that it might be a catchphrase of sorts of another manga character, but that didn't help me grasp the meaning.