Generally speaking, cats and dogs are recommended, as mainstream pets are not unreasonable
Cats like to be clean, clean themselves frequently, and are usually relatively quiet (but they can be very naughty when they are young). And if you don’t buy a famous cat, the price will be very cheap. Adopting a stray cat is also a good choice.
As for dogs, Schnauzers are actually very suitable for accompanying the elderly. They are easy to move and quiet, and they have no body odor or shedding. However, the price will be higher
But in fact, animals are just like people. They all have their own personalities. There are cats that are friendly to people, and there are cats that are aloof and even hate people. The level of naughtiness and noisiness of each cat is also different. If you decide to live with an animal, you must be responsible for its life and tolerate all its personalities and characteristics. You must think clearly about the shortcomings, and you cannot throw them away if you are not satisfied. This is the most important thing.