Aging is one of the factor that can cause weakness in the back legs of your dog. Following is list of some factors that can cause weakness in the back legs of dogs.
1. Arthritis
2. Aging
3. Ticks disease
4. Autoimmune disorders
5. Musculoskeletal problems
6. Disc dislocation
7. Disc degeneration
8. Bone tumors
9. Cartilage damage
10. Anterior cruciate rupture
11. Osteomyelitis
12. Spondylosis
13. Patellar luxation
So, take your dog to vet for diagnosis and treatment.
1. Arthritis
2. Aging
3. Ticks disease
4. Autoimmune disorders
5. Musculoskeletal problems
6. Disc dislocation
7. Disc degeneration
8. Bone tumors
9. Cartilage damage
10. Anterior cruciate rupture
11. Osteomyelitis
12. Spondylosis
13. Patellar luxation
So, take your dog to vet for diagnosis and treatment.