Number 1 # females come to me and not the opposite way around.
Usually in a breeding loan the females go to the person who own the male this way the male can breed other female as well, additionally you can control what is bred to your male.
Number 2# Have a solid contract that will detail EVERYTHING:
How the animals are divided the type of split whether it is 50/50, 70/30 etc (split depends on the value of the animals if one is more valuable than the other obviously the person with the most valuable animal will get a bigger split.
Who gets the first pick
What happen if one animal becomes sick, requires a vet and who will pay for it.
What happens if the animal die how will it be replaced.
Etc
Friendship can go sour because of breeding loan when time comes to do the slip or if something happen to the animal on a loan.
Now as far as what happen when animals come on a loan with me.
It's 60 days in quarantine than the animals are moved to my snake room where it will be another 30 days before they are being paired to anything.