Absolutely everything

Sparky shook Mackenzie's hem violently. Mackenzie thought quickly and swiped her t-shirt off and tossed it along with the dog onto the ground, briskly walking away from the scene to avoid that psychopathic mutt with only her bra to cover her top half.

Unfortunately for her, Sparky quickly let go of her shirt and jogged right back up to her, chomping on the middle of her buttcheek with her shorts, panties, and even a little bit of her flesh in the vise grip of Sparky's jaws.

Mackenzie reached back to grab the back of Sparky's neck and pull him off her ass. While she could get his teeth out of her flesh, his teeth were still in her shorts and underwear when he started to shake his head back in forth out of both aggression and panic as his jawhold on Mackenzie no longer accounted for gravity. This, in turn, caused Mackenzie to let go of his neck, making him fall even further and shake even more panickedly until a giant gaping hole in Mackenzie's shorts and underwear revealed much of her ass, including four points of red where Sparky had bit her originally.

With almost half of the back of her shorts gone, Mackenzie gasped but could do nothing before Sparky jumped back up, this time grabbing onto the hem of Mackenzie's shorts and underwear on the opposite side and shaking back and forth once again. While Mackenzie's flesh was unaffected this time (except for some residual Sparky slobber splashing on the small of her back), the aggressive shaking tore up the waistband of the shorts and snapped the elastic of the panties, causing both items to fall to the ground and leave Mackenzie naked except for her bra and sandals.

Mackenzie was positively fuming at this point, and turned straight around to confront Sparky's owner head on. On her way, Sparky jumped up and grabbed the back of Mackenzie's front-clasp bra. pulling her back in some form of wedgie for a few seconds before the clasp broke apart and the bra fell back and down to the ground. Mackenzie took a deep breath of frustration and continued her saunter to the owner.

"You!" she aggressively pointed at the woman, who seemed quite unbothered by the show as Sparky stayed behind to chew up the remains of Mackenzie's clothing some more, "this is all your fault! I could have been hurt! In fact..." she turned around and pointed at her ass where Sparky bit her, "he did bite me!"

The woman could only shrug, "he isn't usually like that... you must have provoked him somehow."

Mackenzie was nonplussed by the woman's dismissive attitude and even scoffed a little.

"That does it!" Mackenzie pulled her phone out of her purse, "I'm calling the police, animal control, everyone!"