Felice has been limping for some time now but its only when she walks really fast, we're not sure what caused it but she walks normally fine and runs evtremely well with no sign of limping , she can jump really good to, I was checking her feet today and putting some pressure on her feet, stretching it in out and put them up and down and she's fine until you get to her back foot and when I pressed it and she kind of growled at me, of course she was growling the whole time but I was wondering if I should take her to the vet or not, she gets extremely stressed out when she goes anywhere near the car and last time she went to the vets she got extremely sick so my parents are hesistant about it, and yes she's an outside cat but she never goes outside the backyard and stays by the plants on the side usually, and some days she's prefectly fine, she'll run and chase and walk fast with no problem and other days, sometimes she limps .. any help??