Final answer:
The dachshund is likely suffering from musculoskeletal pain, potentially from intervertebral disc disease (IVDD), which is common in the breed and causes difficulty in activities that require spinal flexibility.
Step-by-step explanation:
The type of pain likely causing the dachshund’s difficulty climbing stairs and jumping onto the couch is probable musculoskeletal pain, which could be indicative of intervertebral disc disease (IVDD), a common condition in dachshunds due to their long spines and short legs. IVDD can cause spinal cord compression leading to pain, nerve damage, and even paralysis.
Over the course of six months, chronic discomfort from this condition may have progressively worsened, thereby hindering the dog's ability to perform activities that require spinal flexibility and strength. It is essential for the client to seek veterinary attention for a proper diagnosis and treatment plan, which might include medications for pain, anti-inflammatory drugs, physical therapy, or possibly surgery.