Well, if you have a non-pedigree and you are letting her out and there are entire males next door, the question of when to breed her will be academic, she will get pregnant on her first season.

You should consider the possible costs first - chances are high of course that everything will go well, but if it doesn't and you end up with an emergency caesarean, you could be into four figures (depending on your vet's emergency charges).

Liz