Assertion: rottweiler's environment | /r/HasProperty | sold for dangerous muling
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text: But as the Rottweiler breed became popular, so did the over-breeding of Rottweilers in puppy-mills, underground breeders, black markets and in abusive, low quality and unsafe environments sold for the wrong reasons, such as dog fighting, dangerous muling and other activities that often resulted in serious injuries leaving them severely disabled, or death.