Before I went on March Break, I left my hamster Scrappy with my friend.
Now that I'm back, I went to go bring him home today.
When I got there, something seemed wrong with him, but I told her thanks for watching him. When I got home I examined him. Scrappy is a black bear hamster, With pink ears, a pink stubby tail & pink feet. The hamster she gave me back was similar but these are the problems:
This hamster had shinier, darker fur.
This hamster was chubbier.
This hamster had white feet & tail; not pink like Scrappys.
He had a white spot on his back, Scrappy doesnt.
His ears are black, Scrappys were pink.
His nest was different than the way Scrappy built his.
Please respond with an answer
Check for any physical differences in the hamster's appearance, such as size, coloring, or markings. Observe the hamster's behavior and see if it is different from before. Also, look for any changes in the hamster's interaction with you or its environment.
It depends on the hamster, so i dont know.
What is a hamster that has no legs called? A furball.
you get it
Ask yourself one key question: "Do I want a hamster?" If the answer is yes, then any hamster will do.
Well first how long do you have your hamster because if you have it only a couple of days it doesen't know you and don't want's to be holded.Or maybe you didn't treated your hamster very well.Think about that.
If they look different in their areas, then they probably are different genders. I'm not a hamster expert, but I do know that when hamster give birth they will eat their children if they get frightened and they will also eat the weak hamster babies. So if one of your hamsters is pregnant, then just know that so your not really freaked out when that happens.
a hamster doesnt know how to swim this is all i know soz
you will have to ask the person who sold you the hamster that is the only way.
If he bites you.
If you see the hamster looking and nibbling for a place to get out, then they want to get out. I found this answer because my own hamster escaped. 
hamster tumors are just the same as a humans. When you start to feel small or large bumps on a hamster you will know that its a sign and you should immediately take your hamster to the vet, and they will see what they can do, or if your hamster is in pain, they can put your hamster to sleep humanely.