Jen left to go to school, now as a freak of nature. However, she didn't get far before a black cat crossed her path. A classic sign of bad luck, and even more so with her curse. The part of Jen that was now canine had an uncontrollable urge to chase after that black cat. And because of the affects of the curse, the cat didn't run away, but instead headed towards Jen.
Jen didn't want to become more animaslistic. But the dog in her couldn't help but chase the cat. So instead of trying to fight that urge, she used it to her advantage. She used the urge to chase the cat to keep herself in motion, making it so that the cat couldn't keep up with her.
But this truly wasn't Jen's lucky day.
As Jen was running around avoiding the cat, she tripped over a crack and landed with an "ARF!!!"
While on the ground, the cat had a chance to catch up with Jen. The black cat then began to nudge it's way in Jen's pussy, causing her to let out a "YIP!" of surprise. As the cat continued to push it's way into Jen's pussy, the pleasurable sensation it created caused her to pant uncontrollably, before she gave out a howl of pleasure.
For being a smaller animal, it seemed to take forever for the cat to make it's way all the way into Jen's pussy. But once the black cat was all the way in, Jen felt the sensation of the cat merging with her body. And more transformations took progress. The first thing Jen noticed was a pressure coming from her lower back. She felt her the sensation of her lower back suddenly pushing outward. Jen looked back to see a long, furry, black tail extending from her lower back. The next thing she noticed was sensation of swelling coming from four spots on her torso. Jen lifted up her shirt to see what was happening. She saw four bulges growing from her torso, each bulge having it's own nipple. Jen was growing two new pairs of breasts. Just like a cat, she now had six tits. The final thing that she noticed was the sensation of a need to mate. The black cat she merged with was in heat, and that heat transferred to Jen.
Jen now had qualities of both a dog and a cat now. And a cat in heat no less. And if she were to try to mate with any animal, it would just end up merging with her. So unless she had sex with a human, there was nothing that could alleviate her need to mate. But she wasn't ready to be a mother...especially considering that there's no telling what the product of her having children would be.