My bitch will come into season in May the stud dog that I want to use will only be 10mths. Can he have his pre-lims done at 10mths or does he need to be a year.

I know a breeder who did a boy at 9 months to use and had his cerf done and a Penn Hip and used him. It was a struggle to use him she had to hold them together for the tie because of being so small. Good Luck!!!
The Dam did conceive but a risk you take also! Being so young.

OFA pre-lims can be done as young as 4 months I think, that along with possible Penn-hip would be a great start for this boy! Good luck with your breeding, the youngest male I've ever used was 11 months and he did fine A sperm check prior to using him might be a wise idea?

My Rhodesian Ridgeback friend had an "oops" breeding with a SEVEN month old puppy, and wouldn't you know, the bitch had 12 puppies! She didn't go to any dog shows for a long time as she knew the word had gotten out and she was so embarassed!
You can do a PennHip as early as 4 months, but OFA they recommend 7 to 8 months at the youngest...and things can change. You wouldn't want a surprise bad elbow or hips at 18 months. Unless you know the line really well I would think twice and maybe consider this youngster for the next breeding you do with your bitch. Have a plan B lined up, it's good breeding sense anyway! "Stuff" happens!

I bred to a boy who had had his prelims done at 8 months. He was OFA prelim good. He didn't pass at two.... with so many great stud dogs available to us, I'd wait. Why not use his dad?

It's doable, very risky for the same reasons mentionned previously (hips being good at 10 months not passing at 23, or elbows...)

I understand wanting to use a specific dog, but could you go to his dad? It's just a suggestion.