Best thing you can do is treat the vine for those chompers. Search leaves for eggs. And do everything you can to keep the vine healthy. Water properly and fertilize. In early Spring check for eggs and spray again.

Sharon, although my vine was eaten bare, I hatched hundreds of fruitillary butterflies. That part I like. I was just trying to find a vine that could grow alongside it that the caterpillars wouldn’t eat! It was very healthy.

Ohhhhh you meant to do that! :)

Would something low at the base of the vine detract from the munched vine enough?

How big is the pot? Pictures? (Of pot or cats.)

Here is a series of pictures showing a healthy vine, the vine as it is consumed, a Fritillary butterfly emerging and a vine with nothing but sticks! I love providing for the butterflies; I am looking for suggestions on a companion vine that could grow in the same pot on the same trellis so I have greenery on the trellis while the passion leaves are regrowing. The pot is large and deep. What do you think would make a good companion?

Moon Flower, Ipomoea alba, might be a good option. Depending on your zone, it would be an annual or perennial. Perfect timing with the vines would have the Moon Flower blooming as the butterflies finish their breeding cycle.

I am in Texas, zone 9. Would Moon Flower still work for me?

What do you think about adding a dragon lady cross vine to the pot?

Moon Flower might be the perfect annual in zone 9 Texas. It will love your heat and can die over the winter. That would be a bit less root competition for the passion vine of unknown species that I will take to be a perennial. The cross vine is a perennial evergreen. Those two, passion and the cross, fairly aggressive vines in those small pots may be too much for either's well being. Can you plant one of the vines in the ground?

Should they ever bloom together, I'd prefer the white and guessing purple in the passion combo better than purple and orange.