i have a pitbull and she has several holes in her paw from where cheatgrass has gotten in there. i can't afford to take her to the vet to remove them how can i get them out. she is very patient and tolerant to pain and me picking at them but i can't seem to find it to remove it. help what do i do?

Optional Information:
Age: 1; Female; Breed: pitbull

Already Tried:
removing it with tweezers