Female

She does have a massive (still erect!) phallus, but the canine reminds you so much of a hyena, and if she were a hyena, she'd be female. She carries you into a side room with unidentifiable instruments on the walls and a large steel table in the middle, and dumps you on the table.

From all around, a robotic voice asks, "Identification and procedure?"

"Maive," the canine says. "I've bought two enhancements or this dreg."

"Please confirm procedures on file. Procedure one: Chullian pheremone implant, set to continual emission."

"That's right."

"Note: for a small upcharge, we can add a controller to lower or halt emission for -- "

"Stop trying to upsell me. There's no situation where this dreg won't need to be sexy, so I don't need your fancy controllable. I want the standard unit."

"Confirmed. Procedure two: anal reinforcement to guard against friction."

"Yep."

"Note: a procedure to extend girth capacity is also available for -- "

"No, I bought a physical stretching thing for that. Just the friction."

"Confirmed. Please leave the room so that I can administer the knockout gas."

Soon, you fall asleep.

You wake up to noise and movement. You're being carried over the canine's shoulder down a metal walkway. At the end of the walkway is a large vehicle, about the size of a three-story building. The shape and lack of wheels suggest it's a spaceship.

The canine doesn't seem to have realised that you're awake. If you let her carry you into that ship, who knows when you'll have the opportunity to leave again? This might be your only chance.