Our dogs were getting into nasty fights and couldn't even be in the same room together. (zenergydogtraining.com)
Just yesterday, a client whose dog I worked with years ago told me that her 2 dogs got into a pretty nasty fight while out in the yard. (atlantahumane.org)
Perhaps the relationship received an injury in the form of a particularly nasty fight, a hidden secret, or infidelity. (tacomachristiancounseling.com)