@emilia May we know just why you have decided to spay her now ?
Unless spaying her is going to substantially improve her quality of life, I would advise against it.
Yesterday I noticed my basenji restless. She kept putting her butt up in the air and plopping it down on the sofa. She would occasionally yelp and she is now cautious of getting up and down from the sofa. When she tried to shake off she does it very slow and for only a second. She had a very hard time getting up in my bed last night and I had to grab her backside and scooch her up. She is eating just fine and is going to the bathroom just fine. She's kinda mopey and doesn't run when she hears the cat next door like she has 2 days ago. Thoughts?
Since it could be anything from a soft tissue injury to a sine injury, I would immediately take her to the vet for an examination
You do not mention how old your girl is or if she recently had a tick issue. When Basenjis are in advanced age they can be afflicted by arthritis. Lyme disease can damage joints. My females at an advanced age, around 11 - 13, have had arthritis. They would hop down from the couch and injure either a joint in the paw or leg or shoulder. I noticed because they would either : stumble on landing then limp; or they would come back to the sofa and could not hop back up. They could not pressure or weight on a joint in preparing to jump up. I would watch them hesitate and stop. Arthritis is unfortunate and difficult to treat. I would intervene and not let them hop up or down until the tenderness went away (up to a week). I would always use a new voice command of 'wait' then lift them up or set them down on sofa or bed. 'Wait' was never used at any other time. A series of steps could help if you can get them to use them. They would get better over time and the tenderness of the condition would subside, for months at a time, until they hopped down and re-injured themselves. It is hard to get a Basenji to take it easy and you can't be with them 24 hours a day. However, you may be able to change arrangements such that there is nothing to hop up to or down from when you are not with them. Eventually my girl would come up to me and wait for me to lift her up to the couch. And of course when she did feel better she would not wait at all and just proceed to hop like she always had before.
Well, it describes something, but the context is not all there. How old is she? maybe 'menstrual' cramps? all species seem to take on really bizarre quirks at this time…. If she is older and spayed, then anything from soft tissue to musculoskeletal pain or discomfort. ?internal organ pain????? maybe a trip to your DVM as an exam or bloodwork may help rule out a specific problem......