Large Animal Veterinary
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Hello. Thanks for the question.
I routinely cast tibia/ fibula fractures in dogs and they do quite well. As long as the bones are lined up reasonably well (~ 50% alignment), they can heal if we give them time. I usually tell owners to expect at least 6-8 weeks in a cast. In an older dog, 8-12 weeks is a reasonable expectation.
Surgery to plate the leg will allow it to heal faster, but the cost associated with surgery can make it an unrealistic option for most owners. In those cases, casting is an appropriate plan B. If it were the femur, then amputation is a better option as casts along cannot immobilize the hip. In a tib/fib fracture, though, casting is sufficient.
I hope this helps, let me know if you have any other questions.