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Hi. Welcome to Just Answer. My name is***** When I have a splint on a dog for a broken bone, it is typically on for 4 - 6 weeks. This is typically the time frame that is needed to immobilize that area to allow for a bony callus / healing to happen. With a young dog like this, typically the bone wants to heal quicker than if it was in the same location of say a 12 year old dog. I like to take an x-ray around 4 weeks to see how the bone is healing.
When splints / bandages are applied, they have to be monitored closely as they can become tight (especially in those that are growing quickly). I can't say it is ok to remove the splint as I'm not there to evaluate him / the case / or to take x-rays to see how it is healing. This should be something that your vet specifically makes that recommendation based on their assessment of the case.