I think de-clawing a cat is a terrible thing to do to it. Last time I checked into it, the whole end joints of the cat's toes is removed.
How would you like to have the last joint of your fingers cut off?
One can clip and file their nails so they are less sharp.
The animals probably don't think that having their sexual organs removed as being "fixed" - but it makes their owners' lives easier.
Some plants are poisonous to animals. You might want to check that out.