Hamsters are very active animals. They can run up to 5 miles in the wild. Having a wheel in their home is a necessity, but it must be the correct sized wheel.
If your hamster's back is bent while on their wheel it is too small for them. If they are continuously running on a wheel that is too small for them, they could eventually have spinal injuries. When your hamster is on their wheel you want their back to be flat.
Correct sized wheel for Syrian hamsters: 27cm and above
Correct sized wheel for Dwarf hamsters: 17cm and above
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