Also it may be an unpopular opinion but if you know what you’re doing you don’t have to fix your dog. My two females 9 & 8 years old aren’t fixed. My Boerboel isn’t fixed. My Golden who passed away wasn’t fixed. The only dog I had that was fixed passed away due to complications of being fixed. If your female is going into heat just keep them inside, supervise them when out, it can be annoying for some but it isn’t that hard to keep them from breeding. Not fixing a female can lead to hormone issues that can cause cancer, but fixing them can do the same, so it’s up to you to judge wether it’s worth it based on tha