I have a yellow female that had regular bowel movements for 5 years. She would not go in her kennel and only in the airing yard and was always firm. She had a litter last year (her second litter) shortly thereafter she became loose and has never completely firmed up and will have mostly air with some loose stuff 3-5 times a day in her kennel and she really will strain considerably when having a bowel movement. She has two semi to firm movements a day but she strains and has mostly air and some really runny movements 3-5 times a day. We have done fecal testing and nothing. We used foraflora and changed dog foods a couple of different times. She is still the same. She acts and looks normal. Runs, plays and retieves with a purpose. Any suggestions?