The Campbell dwarf hamster is a small hamster that usually grows about 8–10 cm (3–4 inches) long. It commonly comes in colors like gray, brown, black, white, or a mix of these, sometimes with a darker stripe along its back. It is tiny, active, and very cute, making it a popular pet choice.

The Roborovski dwarf hamster is the smallest type of pet hamster, usually about 4–5 cm (1.5–2 inches) long. It is very fast and active.

Common colors are sand (light brown), white, and sometimes a mix with gray or darker markings. They usually have a white belly and eyebrows, which makes them look very cute and “expressive.”

They are friendly but not very fond of being held because of their tiny size and speed.

The Syrian hamster (also called golden hamster)9 is the largest common pet hamster, usually growing about 12–18 cm (5–7 inches) long.

They are commonly golden brown, but can also come in black, white, cream, gray, or mixed patterns depending on the variety.

They are solitary (must be kept alone) and are usually gentle, easy to tame, and good for handling, making them one of the most popular pet hamsters.