With Yorkies, first breeding would be okay at 18 months or second heat. Of course this might not be right for all of them though. No first time breeding after three years old.
There is a shot if the female gets pregnant but it is dangerous.
The best way is to get at least one of them altered or take one to somebody else's house so there are no oops litters.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |