#but Sonic teases him that he might get one and nearly loses a significant chunk of his hand for it

[true-blue-sonic]

When it comes to doctor appointments, does Silver react like how a feral cat would at a vet, specially with shots? (I'm giggling at the thought of Silver wearing one of those pet cone collars you see in a vet)

I think every single alarm bell his body contains goes off the moment someone around him mentions he should go to a doctor. Eggman Nega has led to that term being all but tainted for Silver! And no amount of sweet-talking and logical reasoning are going to make him change his mind. So getting him to the doctor is already quite a hassle, getting him inside the building even more, taking him into the room is all but impossible, and that doctor kind of needs to fear for their life once Silver sets his eyes on them. Espio, Vector, and Sonic are needed in the room to pin Silv down on the bed so the doctor can do some basic things like give him a full body check! But I think the fact that none of those three seem particularly worried does tip Silver off that he might not be in that much danger here, and the doctor could show some basic procedures like measuring blood pressure and listening with a stethoscope on Sonic. Considering Sonic doesn't immediately drop dead and comes out of it all entirely fine, Silver at least is convinced to not immediately bite the doctor for getting into his personal space. But he hates every second of it, especially when they get to more invasive things like cleaning out his ears and eyes or drawing some blood. And the absolute hell he raises at getting shots (he later admits that he's been through much worse pain but it is the principle of things and it caught him by surprise) is remembered in the clinic for quite some time to come! In the end, Silver leaves with every single word of warning in bright red plastered all over his healthcare record, he is crabby for hours afterwards, and Sonic, Espio, and Vector are entirely spent. Subsequent visits go somewhat better, if they do less invasive procedures on him. But overall, Silver would not be sad if he never has to go to the doctor again!