Hi Juxie -

No this is not a breed issue. There are several options to work with to help Ruby.

1. Desensitize her. This means taking her on short car rides and NOT going to the vet. going to someplace where she has fun and is happy. You may have to start with a drive around the block and get out, give her a treat, and leave it at that until the next day. You want her to start associating the car with fun things, not vets and shots and surgery and such.

2. You may want consider someting like Comfort Zone, or Feliway. They are relaxers which help calm the animal. You can google them and read up, see if either appeals to you.

I am sure other folks will also offer ideas. Good luck!
Sandie