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Hi. My name is***** I'm sorry to hear about this little guy's situation. His name is Shaun? He just started limping here today? Is he otherwise acting normal? He can put some weight on it?
Did this just start this evening? Has he ever limped on it before?
How long have you physically seen him limping? When did you first see this? Is he placing any more weight on it from the first time you saw this?
Honestly, I wouldn't try to palpate it to see if it is broke. The best thing an owner can do at home is to actually just leave him alone and let him rest. If he's putting some weight on the leg as he walks, it most likely isn't broke. They can have femoral head fractures and still walk on them, but long bone fractures typically don't let them walk on the leg. Could he have just landed on it wrong? Could he have been in a tussle with the other cats and got the leg bit? There are no safe over the counter pain medications to give so at home, time and rest is something that can be done. A lot of owners will give them 12 hours of rest to see how the limping progresses / improves.
If there was an ER clinic readily available and / or he was really painful / crying, then it would be more of a push to get him seen tonight. If he's limping around and for the most part not stressed, a night of rest would seem like a very good next step. If he is able to rest in the restroom quietly, then that would be a good place. Ideally he's just in an area where he rests and isn't too stimulated.