This is normal puppy behavior and also a way of establishing dominance in their small pack. In order to avoid one of them becoming overly shy, it is a good idea that you begin taking them together for short daily walks on a leash to release some of that energy and also learn manners. Littermates will play-fight a lot and it can sound like they're going to kill each other, but blood is not drawn and no skin is broken. If it goes to actual injury (skin is penetrated) then it has gone too far. To break up a puppy fight you can probably scruff them (hold each pup by the shoulder skin firmly on the ground) and speak sternly. Think of how mother dog would have held a misbehaving pup with her teeth and a paw while she growled (stern warning).
Make sure to have separate training sessions with each pup as they grow up. A puppy class with off-lead, supervised socialization is a good idea so they learn from others what is not allowed.
When two puppies love each other alot they decide to have babie puppies.
I don't know why; I'm not a guppy-whisperer, but as far as I know, it is normal. Be careful though. It shortens the life of your fish.
Puppies need to stay with their mothers and littermates until at LEAST 8 weeks. They cannot be removed from them until they are weaned; the benefit of staying with the mother and litter is bite suppression (i.e. they teach each other not to bite) and socialization.
No you BUM Yes they can at times
they bite each other for there lives.
they bite each other.
They like each other and wants to mastrubate
Dogs bite each other's necks as a natural behavior rooted in their ancestry. It is a way for them to establish dominance, play, or show affection.
No
You could have puppies with birth defects when the parents mate with the puppies. If you plan on keeping them all together, you should neuter the puppies. The mum and dad will be interested in each other the next time the mum goes into heat.
Bitches (in the technical sense) place puppies in their mouthes for many reasons, including moving them (they don't have hands- that's why puppies have so much loose skin around their necks) and cleaning them (Puppies cant relieve themselves by theirselves until older)
they will have similar DNA to each other and to their parents.