My dog is 17 years old. Part poodle and? She has arthritis and was abused as a puppy before we adopted her. The last few weeks she has started having trouble getting up and down. But for the past week she is having trouble walking. She isn't eating much these last few days and its very difficult for her to have a bowel movement. Its breaking my heart to see her this way, does anyone have any ideas of what could be wrong?