I'm a divided household. You do what you need to do to insure safety and quality of life for all your dogs especially your seniors. Seniors in a household come first get all the perks. The younger ones get the restraints to their schedules .. And it could be your senior is experiencing medical issues that the female is reacting to.. Dogs can smell cancer cells, sense changes well in advance to seizures.. All my dogs knew my one senior had illness in his body, maybe a year in advance before the first tumor showed outside the body.. They all were attracted to one spot on his rear end and they would sniff and push their muzzle into it. and linger all around it. No matter what the cause, you have to set up for safety first and make it work.