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 jackal hybrid and a full jackal at will. "Inu" is Japanese for "dog". It was eaten by Chaka.

Strengths and Weaknesses
This fruit enables the eater to become a large jackal at will, granting an increase in physical strength, speed, and senses. As a jackal is considered to be a carnivorous subspecies of wolf, the power this fruit grants is well suited for physical combatants, more so than an average Zoan.

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

Usage
As seen by Chaka, this Devil Fruit increases both speed and power, allowing Chaka to jump onto the roof of Alabasta's castle, where Crocodile was sitting. Chaka has used this based on his emotions, turning into a Jackal when Crocodile enraged him, combining his animal strength with swordsmenship. 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 against Crocodile, who simply changed his body into sand to allow the strike to bypass him.

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.