Why is your Maltese experiencing difficulty in jumping on the sofa after 2 years. She's only 3 years old.?

Your Maltese may be experiencing difficulty jumping on the sofa due to several factors, such as potential joint issues like patellar luxation or Arthritis, which can develop even in young dogs. Weight gain or muscle weakness could also contribute to her struggles. Additionally, if she has experienced any recent injuries or changes in her environment, that might affect her ability to jump. It's best to consult a veterinarian to assess her condition and receive appropriate guidance.