Liz- my dog, Jasper is neutered. That was done within the first two weeks that I had my last batch of doggies way back in July
The dogs I have overnight most Fridays are never off a slip lead ( LOL, actually 2 slips at all times) and never left unattended in the back yard. Lots of the ones that come through my basement ARE altered already...but even still I never let those dogs mix with my dog, my neighbors dog or other fosters.

The cycle passed and all went back to normal. Until next time.

Oh, and of course this dog is in a fence all the time. Either Jasper is in her yard, or both are in mine. They love to play together. Just this morning,Jasper jumped the fence to get into her yard. He whined and carried on for ten minutes and when I didn't come out to put him over into her yard, he jumped over. Then cried and whined to come back home when she went in. He wouldn't jump back over for.some.reason.