Advice on littermates. I keeping one of my dogs pups, but its not a certain but would like 2, yes its a lot, and i have the time to imput. But i want to know is it bad to keep 2 littermates, 1 boy and 1 girl. Ive heard litter mates fight and dont know if its true, so any advice.?

Bad idea.

http://www.veterinarypartner.com/Content.plx?P=A&A=2043&S=1&SourceID=47

http://www.uvhs.org/behavioral_docs/double_trouble.pdf

Even if everything goes as well as can be one downside would be having two dogs getting elderly together could be expensive.
Lots of people tend to find with two that it is more than double the work of one as you need to spend a lot of time with the pups on a one to one basis otherwise they bond more strongly with each than with the owner.
I've never had two pups at once but can just imagine how it could turn the joys of having a puppy into more of a chore!
There are a few folk on here who have kept two so no doubt you will get peoples personal experiences before long

Bad idea. I've done it, and it spoils the fun of having a puppy, apart from being more than twice the work. People say they have the time, but unless you have staff to keep everything else running smoothly in your household then you really haven't got time to do both puppies justice.

For every 5 minutes they play together they need 15 minutes each apart and interacting separately with you, to avoid too close a bond (and intensity of future rivalryat adolescence) with each other at your expense. It's not just littermates that are likely to fight, it's two puppies of very similar age generally.

And even if they don't fight, they might not really be happy. Of the littermates we kept, after one died suddenly at the age of 10 the other changed personality and became a much more relaxed dog. We hadn't realised how stressed the constant pressure of his sibling's presence had made him. He's totally different with the youngster we've got - there's no rivalry at all, just companionship between them.

I've kept littermates several times (NOT through choice) and it is nicer to go to the dentist.

I have litter mates here Lincoln and Lexis from my first litter,7yrs in the planning, the only male was going to be sold till he turned out to be pick of litter and was told would make an ideal first show dog,no seasons to dodge, his sister was staying to be shown and bred from if she came up to scratch, she didn't, tried to rehome her when she was about 12 months old but they were either a dogless family and she had been used to 4 others for company or something didn't click.

Last year I decided to retire one of my other bitches Chase and paired her up with Lexis and they went off to live with a male couple one of them worked from home, 4 days later Lexis was back, she wouldn't eat or drink,whined under her breath 24/7 and was thoroughly miserable, I thought she may have been missing her brother but it was my other male the little minx was all over when she got back, Linc barely got a sideways glance from her even when he showed he was pleased to see her.

They are 3yrs 9 months old now and life just goes on, play fights but nothing serious, when there are seasons around it is the 2 lads who are more likely to get into a fight.

Would I do it again I don't know, I won't be keeping any more males that for sure whilst the other 2 are here. It does take more work but I had the time to give, only you know if you could do it and if the reasons are the right ones but be prepared to rehome one if things don't work out.

I did worse... I kept 3!!

BUT...I let one go at 14 weeks ( shock horror!) and he waltzed off with a happy skip and jump and has been fabulous for his very doggie active owner.
I was then left with 2... which I must say is probably 3 times the work of 1.

It needs lots of different walks, training and experiences done individually when its would be so much easier to let them do what they want... that is play together all the time.
Ive sent one ( at 16 weeks) up to live with a friend for a while as she works in a huge boarding kennel with lots of customers and comings and goings. He is attending a different training class with new dogs and together with loads of outings with friends... he's loving it and really beginning to shine.'Mr sociability plus'. :-)
The other is here and is going everywhere with me on her own... shaping her own personality. Her and I are enjoying the one to one attention and her character is becoming more obvious. 
Its a lot of work if you want to do it right.... but if you ever think its to let them have a playmate.... forget it.
A pair of unruly, self obsessed teenage twits is likely to be what you get.

Also with opposite sex litter-mates, you could easily end up with an accidental mating, and they could get very upset being split up for 4 weeks every six months when the bitch is in season.

Thank for advice every1, just really stuck on which 1 to keep lol, and i know its a lot of hard work, just hard to decide, male or the female lol, but again thank very much for time and advice.

If there is very little in it and your ultimate hope/aim is to breed a line of good dogs, then it's a no brainer, keep the bitch.  As a bitch owner you have the control of which males you choose to mate her to (assuming they are happy with your bitch).  As an owner of even the best male, you are at the mercy of bitch owners, will anyone use him? will the ones you admire use your boy? and even if they do you are unlikely to get pick of the pups they produce, unless it's the opposite sex of what they wish to keep.

im the exeption to the rule and have had litter sisters twice,and would have done it again,happily,but ive now got three young bitches,unrelated.my first two were really easy,after all,you get all the toilet training etc done at the same time,and they amuse each other-also are at the same stage in training.My second two were harder work,but by two years old were well trained and great companions.I dont regret it,maybe ive been lucky.
edited to add,these are pets first and foremost.

On the other hand, if you keep the boy, you won't have to deal with the stress and mess of breeding litters and if he is used a bit, you will be able to keep a son back and have some sort of paternal line going.