I once had a Malinois who became aggressive after her spay,probably as a result of an imbalance in her hormones since most of the estrogen is now gone. That makes me reluctant to try that again if I get a female as second dog. Still on the fence on how to solve this.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015