Inu Inu no Mi, Model: Jackal

The Inu Inu no Mi, Model: Jackal (イヌイヌの実 モデル：ジャッカル) is a Zoan-class Devil Fruit that allows the user to transform into a full jackal or a jackal-human hybrid at will. Inu means dog, and this is one of the many Inu Inu no Mi models around. It was eaten by Chaka.

Usage
As seen by Chaka, this Devil Fruit increases both speed and power, allowing Chaka to jump onto the roof of Arabasta's castle, where Crocodile was sitting. Chaka has used this based on his emotions, turning into a Jackal when Crocodile enraged him. Chaka has only shown a single attack.
 * Narikiba (鳴牙): After transforming into his full jackal form, Chaka draws his sword, puts it into his mouth, dashing towards his opponent swiping them with the blade. This attack was ineffective to Crocodile, as Crocodile simply turned his body into sand.

Strengths and Weaknesses
This fruit enables a person to become a large jackal at will.

This fruit doesn't seem to have any specific weaknesses, aside from the standard Devil Fruit weaknesses.

Translation and Dub Issues
Due to the fruit sharing a similar name to the Inu Inu no Mi, Model: Dachshund, the fruit was also renamed the Mutt-Mutt Fruit in the 4Kids dub. However, in order to differentiate it from the previous fruit, the words "Jackal Strike" were added to the name. This type of naming convention has only been used for this fruit. Other Zoan-type fruits with different models, renamed in the 4Kids dub, do not share this style in order to differentiate one another.