My douge de bordeaux puppy is 5 months 3 weeks this weekend. When she was 3 and a half months old I noticed she was bleeding and a knew this wasn't normal and took her to the vets the vet had a look and said she may have cut herself however she showed no signs of been hurt then about a month later the same thing happened today I noticed she was bleeding again she is fine in herself eating normally. I know they can become more clingy but she is always clingy so I haven't noticed a difference. I was however reading another post where a bitch was messing in the house and over the past week my pup has been messing in the house even when she's just been out for a wee. She has been going outside without any accidents for just over a month now and couldn't understand why she was doing her business in the house. However my boyfriend has 2 dogs and they haven't been sniffing her anymore then normal.

Has anyone got any advice?
Thank you

Have you had her checked for cystitis?  this can lead to bitches 'forgetting' their housetraining and there can be blood in it.  It's very common in young bitches 

Although very painful many bitches don't show the pain, it tends to show in wetting in the house

there wasn't any blood in her wee. I did once have her wee tested the first time I took her and they didn't say anything about her having a water infection. I didn't take her the last time she bled because the time before they said she was fine. But she is fine in herself and eating like normal

The vet needs to look at this to be sure what is going on, take her back again or change vets.