All I can tell you is this is your first GSD and you're new to them. I can tell that much. Plus follow the advice to spay your girl. Even at her age, if her temperment was solid, you wouldn't have the issues you currently have. But you've already been told that one. Breeding is way more work than most realize. Leave it to those who have been learning and learning and have spent so much of their life with the breed working and training and just living with them.
My first GSD was adopted when she was 4 years. She was a family jumper. I adopted her with zero training. She was clueless. She's fabulous with kids, even in her advanced age and horrible hips, allergies triggered by the wrong food or too much moisture in the air or pollen and even water. She loved swimming but it would trigger a serious allergy attack. She's really a great dog once I put some obedience training on her. She has some dominance issues. She's an alpha bitch and an attitude. I never had any problems with her but not many other people can handle her and keep her "opinions" under control. She's a strong determined girl.
Adopted Shelby when she was a year old. She was fabulous. Perfect dog physically. Had an interest in breeding her. Horrible temperment that I quickly learned was not something I wanted to pass on to any pups. She suffered from seperation anxiety so severe she destroyed a great many things (couch, blinds, shattered a window, etc) and she was shy. Throw in terrified of her own shadow and you have a beautiful but poor excuse for a shepherd. Fabulous coloring, perfect build, in height and weight standards for a female... poor mentality. Very sweet dog but life was VERY difficult with her. Leaving the house took a good extra twenty minutes just to contain her so we didn't come home to a demolished house. She was also an extremely slow learner and couldn't seem to grasp what you were trying to teach her past "sit". She was rehomed with a woman who was always home and couldn't go out often due to health reasons. Shelby fit right in with her.
My current female is great. She's beautiful, smart, fits the height and weight for the breed standard... good with everyone. Still not the right temperment. Her temperment usually fits more with that of a retriever than a shepherd although she has her moments. I socialized her and she's extremely intelligent. Love her to pieces. I had her spayed just before her 2nd birthday. I only allowed her to remain intact so I was sure she would grow correctly without horomones being messed with. Heat cycles she was seperated from my altered male and she was restricted to the house. No fun field trips for her. I didn't want a litter. They're great dogs but I will definitely leave the breeding up to those who have a far better idea of what they're doing.
I handled a litter of 11 puppies from the time they were a week old until they were 10 weeks old and rehomed. Their mother was too young to be a mother and poor temperment. Not shy, but aggressive. Luckily none of the pups got that. They got their dads sweet relaxed temperment thankfully but they're all dumb. They're hound mixes but the point is, mom rejected them and it fell to the humans to handle the litter. I was pregnant with my son at the time and the pups parents were our roommates. Our roommate was never home and didnt care anyway. Of the 11, two live here with my inlaws and one of my cousins has another. They're almost 4 years old now. The other pups got turned over to a rescue. Its not something I would EVER want to do again. It was stressful and time consuming and beyond all else, exhausting.
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