
Hi Keith,
I have had dalmatians for very many years. If you
register with the Forum you will have access to my email address - I'll be happy to help in any way I can.
In the meantime, she could come into season anytime between 6 months and a year. I would suggest you buy "The Book of the Bitch" which will tell you everything you need to know about bitches and their seasons, mating etc. You have plenty of time to learn because breed club Codes of Conduct stipulate that no bitch should be mated before her second birthday (usually on her 4th season).
When she is in season you will not be able to leave her unattended in your garden at any time, so the height of the fence is irrelevant! An eager suitor can easily scale 6'.
I am assuming she has been BAER tested and has passed bilateral?