I want to train with my 4 year old GSP, Reagan, for a half marathon.  I just wanted to find out how far you guys have been able to jog with your GSP.  The furthest we have ever run her is 6.5 miles. I feel like she would be able to run further but don't want to push her too hard.  Is 13 miles going to be too far for her, we would obviously be working up to the distance.

Another question... my boyfriend and I are adding a male puppy to our family in a month. SO EXCITED!!! (not going to bring the puppy on runs don't worry) But, we are worried about the introduction and the first month.  We have waited to get another GSP until we felt Reagan was more secure and socialized.  We adopted her from a shelter about three years ago when she was a little over one.  She hadn't been exposed to anything and was therefor scared of everything including other dogs.  She now goes to daycare at least twice a week and socializes fine.  We are worried because she has never lived with another dog and we do know she is possessive of toys and can be food aggressive (only with dogs not people). She is our work in progress and has already made so many improvements since we got her and we are hoping we can work past these things eventually and want to make sure we go through all the correct steps in order to avoid any big problems.

Any advice for the introduction and especially the first month would be great.  We will be moving about two weeks before he comes home, which we are worried will make Reagan insecure for a while. 

Thanks so much!!!

Some pictures of Reagan!!

Baira (RIP) used to come out horse riding with me. I think we did approx 15 miles every other day, sometimes 20 miles, very occasionally more. The days in between i'd be schooling so she'd run laps around the field surrounding the arena lol. Probably did a fair few miles then too.

We did work up to it though, over about 6-8 weeks and I didn't run her hard until she was 1 year old.