Pets

I had many kinds of pets like chicks, ducks, hamsters, a dog, turtles etc.
I like a dog but it need many hands like feed, play with it, take vaccination...
So when I don't have enough time for my pets, raising pet is hard.
I think hamsters can be good pets. Because they keep their food themsleves and play alone ,well.
However, one of the important problems is they can't distinguish who is the owner.
Moreover, they kill each others.