What I've found is that people seem to understand that dog ownership requires a lot more day-to-day effort to care for them, possibly even more expensive at the outset (seems like dog food costs more, as well as other things, granted between cat food AND litter not sure how that works out in the final analysis, I find that dogs are more work). I think there is a different perception of what the levels of commitment are needed for cat vs dog ownership.
I think some of this is due to the perception of cats' independence, hardiness, and the fact that for many people they're sort of.... like some kind of wild animal you expect to fend for themselves. Kinda like "well I adopted this rat/cat from the barn so that was my good deed, they were fine on their own I just sorta elevated their QOL" whereas I don't think there is a perception that the natural state of a dog is to be "making it" "on their own" like a cat sorta can (to be clear, I don't think cats do well and should be treated as some sort of wild animal you just put food outside for, although I think some do actually live this way).
Just expressing some attitudes I've seen amongst people where I live, which is awash in poverty, unfixed animals, animals running sort of wild, and people talking about whether or not they should/can go to a vet for their dog vs cats.
I know someone said to me, "Well most cats are healthy and just fend for themselves. If they happen to be unlucky and have a problem then it's just too bad." Like they're outside the norm and that "rarity" makes it outside the standard of care to pay to take care of it. I think people expect dogs to have more problems. I mean, I think I expect that too although I don't know if it's true, I know cats can be really good at hiding issues.
For me at least, I don't really care how common/uncommon the issue is, it doesn't factor into my decision-making process for vet care for my cats. But I guarantee I am doing things most humans would never do for a human, let alone a cat (not that I make those distinctions for mine).