Are My WinterWhite Hamsters Fighting?

Hi. Ive had my 2 winter white hamsters for about 4 months now and ive relised they enjoy been fighting/playing for about 3 months. ive looked through some of the questions here and looked at the answers but none come across to help me with my question :/ ..My hamsters sleep toghether and are fine but when they play/fight afterwards squeek and one goes on its back and the other dosent really bite it but.. i dont know .. when i touch the hamster thats on its back even whether its really carefull it squeeks . there are no cuts blood or any sign of injury.. and after they have stopped they get on fine untill they start again.. this playing/fighting will second for about 10 seconds sometimes this somedays wont happen at adjectives and others it can happen like once every 5 mins for about 30 mins.. what should i do :(?
it sounds like they are only just sorting their dominancy, one will always be more dominant than the other. the putting on back is just to vote im the boss and as long as they are not drawing blood they should be fine.
Dwarfs play beside each other like that all the time. I used to have two named Bishou & Pashmina. They always tumbled on top of respectively other and mucked about. Everything is fine as long as they don't draw blood.

Worst case senario is one turns out to be the opposite sex and get pregnant.

Answers:    They are basically sorting out their pecking order, much like birds do. Dont worry, whether there is no blood, then no harm - no foul!
You don't inevitability to do anything; they are play fighting or having small disagreements over who is boss. If there are no injuries simply let them get on with it. I preserve three dwarf hamsters and they do this alot but have never hurt each other.
They are just playing, when one goes on its back it's showing mercy (meaning it give in)

So thats why the other one stops, it might have got a little mark on its back, so just take it to the vet or something, they wont cost alot.
If one is rolling on its back that means they DO NOT like respectively other and you should separate them quickly! Good luck with the hamsters!
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