one of my 4 pigs has and has always had nails that growl curled right into her toe and at a very very fast speed.. I'm cutting them every single week to prevent them growing into her toe.. is there anything that can be done and does anyone know what might have caused it? she is 4 years old, ive had her from a baby and she has previous health issues like she has a cyst on her belly (its been seen by the vets, they keep draining it but it comes back, nothing they can do for it at the moment as it isn't causing her pain).. any help?