It can take several months to several years for the condition to fully manifest, though six months is the average length of time from symptom development to full paralysis. (dogcare.dailypuppy.com)
While some dogs may experience dramatic improvement, others may not see obvious change or slowing of symptom development. (iaamb.org)
Cross-Domain Symptom Development Typologies and Their Antecedents: Results From the UK Millennium Cohort Study. (cambridge.org)