is there a dog collar or harness that they can't slip out of or break?

i use a prong collar(buy a good one) when walking only, they work really good also have a pocket full of treats just small broken up pieces works it makes them pay attention to you i treat when we go by other dogs and theyre good. or when walking nice. i also keep a harnesses on my dogs for more control i have a pit also i tie out so i buy heavy duty cable and i replace harness every year ive heard they can break down with weather and sun the plastic clasps so i think if you replace yearly then ok. also when theyre outside i throw treats all over to keep them busy and happy.

Martingale collars or prong collars. Prong collars are perfect for walking, it usually only takes the dog a couple of really good pulls before they realize it's not worth it. Make sure you have someone show you how to use it properly, you could really injure a dog if you don't learn how to use it, or get one that doesn't fit right.

A martingale would prevent her from escaping at home, but you need to be very careful, because it doesn't take a dog long to choke themselves.

My sister's GSD/APBT mix slipped her harness tonight while we were at a gas station...she saw a little girl and NEEDED to go see her lol It's very scary when that happens.

She really ought not be chained up outside for long periods of time. I have no problems with occasional chaining, but there is something mental that happens when dogs are chained 24/7. Not saying you do that...

As for a collar, have you tried a nylon martingale? On a walk I would highly suggest a prong collar.

have you tried a leather collar for outside leash thing to hook her up i would get one from fleet farm they are the best

How about you dont chain your dog up outside.