Most other common, non-musculoskeletal morbidity issues strike Berners at rates similar to other breeds. Prospective Bernese Mountain Dog owners should be prepared to cope with a large dog that may have mobility problems at a young age. Options to help mobility-impaired dogs may include ramps for car or house access, lifting harnesses and slings, and dog wheelchairs (ex: Walkin` Wheels). Comfortable bedding may help alleviate joint pain. Due to these common medical issues, owners of Bernese Mountain Dogs should make sure that their dogs receive OFA and CERF certificates. (2015). 'Inbreeding impact on litter size and survival in selected canine breeds' (PDF). The Veterinary Journal. 203 (1): 74–8. doi:10.1016/j.tvjl.2014.11.008. PMID 25475165. litter size=5.51 ± 2.7, longevity mean=7.74 ± 3.03 median=8.15.