It is good that you are seeking advice about splint care for MrFreeny since unusual behavior is one of the best indicators of comfort level and potential irritation. Splints are very important tools for immobilizing broken bones but can cause problems if they are out of place.
To assess if the splint is placed properly I would try to have a helper hold MrFreely for you or try to examine him while he is sleepy so you can get a good look without him moving around too much. First look at the top of the splint...is there any heat, redness, swelling, hair loss above the splint. Often vets will not leave toes visible below the splint but if his paw is visible check for heat, redness, swelling of his toes too. Then take a look at where the splint is sitting, since he has had the splint on for a few weeks you are in a good position to compare if it seems like it has slipped down from where it normally sits. Also look to see if any layers of tape or bandage material are loose or wet.
The next important aspect to consider is how comfortable the splint seems...is MrFreeny using the splinted leg as he has in the past weeks? If he is not putting weight on it or shaking it or trying to groom at more than normal this new splint may be causing him some more discomfort.
Ultimately you don't want him running or jumping in the splint, limiting movement will help his fracture heal but if you notice any abnormalities like heat, swelling, redness, hair loss, loose or wet banage material or if he continues to act unusually I suggest that you contact his treating vet. It would be best to be sure they examine him to make sure that he does not need any modifications to the splint. Sometimes pain medication may be necessary if the splint is causing him to be agitated.
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