I second what @YARNLADY said, but not say you’re on tight budget, because that’s not the issue. The issue is more that you are curious why this visit is necessary. I expect that the vet will say they’ll check his heart beat, check his coat, check his eyes, check this, check that.
It reminds me when you get a new car, and the dealer gives you a “maintenance schedule” with all this stuff that needs to be done on a regular basis. The majority of it is checks – check the fluids, check the tire pressure, check this, check that, and the total bill is quite a bit, for what is really a bunch of bullshit.
When I got my last cat, before these two young’uns that I have now, I remember taking the cat to the vet and getting shots, and he rescheduled repeated office visits for booster shot after booster shot. Each time, booster shot and office visit = it all added up. The two young kittens I have now, I took for a vet visit the day I got them, to make sure they were ok, and got tests done and some shots, and then they were seen by a vet when they got neutered, and got rabies shots. Other than that, I said to myself, I am not getting sucked in to repeated visits for booster shots and bullshit. They’re alive, they’re well, and honestly, my other cats don’t go out much and they never go to the vet.
@johnpowell: Wow, I agree with others that you are being unnecessarily harsh. “If you aren’t willing to do what is needed” – the question she is asking is “is it needed.” I’m sure if the dog was in pain or looking sick, she would not hesitate to take him to the vet. It’s not like he wasn’t just at the vet not long ago.