Am I crazy or was my dog killing my other dogs?

I had a chow chow for 10 years straight

(Only dog at the time that we had the longest)

Super smart but had attitude, regardless of that, she never liked any dog we would bring home.

She wouldn’t acknowledge them, she would ignore them, and frankly at times look annoyed

We brought over 5-6 dogs in her lifespan at home....and most of them died.

Sounds horrible, but when we would leave them alone with her they would mysteriously disappear or would end up dead in the mountains she would love to go up on. (We would put a fence trying to prevent anymore accidents, but my chow chow would managed to find a way)

One time we caught our puppy following her in some hills but got attacked by a hog, what did my chow chow do? Leave her.

We managed to get the puppy out of the situation and had to give him away.

Now here’s the catch, maybe it was just the area we lived in? But after my chow chow passed away

We got two puppies after a while, and we had them for 5 years now and they’re as healthy as a whistle.

Am I crazy or was my chow chow killing our dogs.