The grey and white feline aroused suspicion after it was spotted regularly nipping through a hole in the jail fence, the BBC reported.
Video of his collar being searched was posted on YouTube by Moldova's justice ministry.
The cat was found to be carrying to bags of cannabis attached to its collar
According to The Associated Press, the Department of Penitentiary Institutions said on Friday that "someone in the village of Pruncul was using the cat as a courier to supply inmates with dope at the local prison."
It's not the first time a cat has been caught out smuggling contraband into a prison.
In January one enterprising feline was spotted attempting to smuggle a mobile phone, selection of saw and drill bits into a Brazilian prison.
And in March, another four-legged-fiend was intercepted as it sneaked mobile phones and chargers into a Russian jail.