i adopted a 2 year old boxer mix about 3 weeks ago and after the first night here she has constantly had a yellow and mushy stool sometimes more watery sometimes it would have a couple drops of blood and another time a lot of mucus. she other wise seems normal. we thought maybe the food was the problem so we have started to the transition of changing it but it hasn't changed anything. i just feel 3 weeks is way to long to still be having diarrhea. vet said could be nothing could be a parasite. just when i go to make the appointment to check it starts to get better only to go right back.