Calcified joint

bonnie had an interdigital cyst treated with antibiotics but it came back so the vet said it could be a foriegn body so they said she would need and operation, they didnt find anything so phoned and asked if they could do an xray which showed nothing was there, but she has got a bump on the side of her foot and the vet said it was a calcified bit on her bone, she has started limping and finding it hard to get up, when i walk her she runs around but when she gets home she hobbles about a bit, im in the middle of moving but will take her to the vets next week, is there any medicaction they can give her as i want to take her on longer walks as i have a very active staff, she is on salmon and potato food which has got salmon oil in it and there evening meal i put extra oil on it