Croup not right, see pictures
Hi, This is my 4 year old female shepherd, she comes from working lines and has always had a straight back, no slant. Today I noticed on her back there seems to be a drop right after her hips, I just learned this is called the croup. Does anyone know what can cause this? She does have arthritis on her spine but this big drop after her hips is something new. Like I said I did just notice it this weekend so I am calling the vet tomorrow, I am very worried about this. Is she losing bone there or what. I am including 2 pics where she looks normal and 2 pics I took today. Any help would be appreciated.
Thanks so much