Well, this one, for me, is fairly recent.
In a story I've been writing down (hope to turn it into a comic soon, once I figure out how to do that and hone my art skills more) it involves my fursona, who lots of you know- Jackdaw, and his less known mate, Ashera.
(This is the only drawing I have of them at the moment. X3 )
(http://fc04.deviantart.net/fs70/f/2014/093/3/3/jaa_by_jerichojerusalem-d7cy3cl.png)
Dun worry, Jackdaw's just fine & dandy ;3I'm not going to explain the whole backstory leading up to the event, because it's quite lengthy and I don't want to ramble, so I will summarize a bit.
.... Forgive the novel....
Jackdaw & Ashera, -after a series of epic events involving pack wars, betrayal, action, a psycho wolf named Molek, and stuff that I'm not gonna go into (sorreh >;3)- ended up becoming the leaders of Ashera's birth pack, and even having two pups of their own. (Ash's oldest pup is the son of her previous "mate," Kelso). But, as things seem to be going well, their old enemy, Molek, who had survived -insert life-threatening battle event that I'm not gonna spoil, here- wasn't going to give them their happily-ever-after so easily. What had begun as conquest and a lust for power, had turned into a twisted game of revenge in his mind, and it didn't take long for him to hatch a plot.
In his lust for vengeance and for power, Molek located a friend of his- a stray mongrel who was well known recently due to his rabies infection. Molek convinced the mutt to assist him, and with the help of another few secretive followers who happened to be members of Jackdaw & Ashera's pack, they managed to lure Ashera away from the camp by faking an emergency. She disappeared after that for a few days, making it obvious to Jackdaw that something was going on. Putting his half brother in charge of the young pups, and the Beta in charge of the pack, he set out in search for his mate, only to be confronted by his old rival, Molek. As Jackdaw prepared himself for another fight, his old foe stepped aside to reveal a vital asset working on his behalf. He had used his rabid pawn to infect Ashera with the virus, knowing Jackdaw would never fight his own mate, and possibly allowing easy access to the pack. A killing two birds with one stone type of thing in Molek's mind- even if Jackdaw didn't chose to fight his own mate, who at this point in her infection didn't even recognize him, she would still eventually die from it, leaving Molek's adversary not physically hurt, but emotionally- which would work just as well.
Obviously, due to the rabies, Ashera stood snarling and foaming at the mouth at the father of her pups. Before Jackdaw could even utter a word, the she-wolf had charged him, treating him just as she would a bitter rival. Her virus-fueled body launched attack after violent attack while Molek stood smirking sadistically as he watched. Jackdaw, while he knew to dodge her jaws to avoid catching the virus himself, did little else to fight back. How could he hurt his own mate- even if she wasn't in her right mind? As he got pushed around and constantly barreled over, he continued to duck and shove back with his paws to keep Ashera's snapping jaws away. Living in-town all his life, he knew this virus and what it would eventually do, if the humans hadn't already done it. It always brought death- and if he left her as she is, it would be a slow, agonizing one. He knew he had a decision to make. He couldn't allow her to die such a horrid death- especially since she'd only go on to further unconsciously hurt those she used to love- and he feared not only for the pack, but especially for their pups; and he knew that she would not want her last moments to be used by killing those she always held so dear. For the sake of Ashera, and their pups, Jackdaw had to do it.
Once again, he found himself be barreled over by the rabid wolf's charge. Laying on his back, he kept his forelegs stiff against Ashera's chest as she stood over him, barking and viscously snapping at his face and throat. Her eyes were already glazed over, and it was obvious that the female he once knew as Ashera was no longer there. From the corner of his eye, he noticed that Molek had disappeared from the ridge where he previously stood watching, but that was the least of his concerns right now. Maneuvering a forepaw, he managed to shove the black she-wolf's head away and wriggle out from beneath her. It took every ounce of energy and will to make his next move- quickly clamp down upon her throat. It was the right thing to do, and he knew it, but even still his jaws grew weak at the thought that the creature he was suffocating was once his beloved mate, and the mother of his own pups. She would have wanted this, rather than unknowingly murder her loved ones. Before too long, her struggling and unnatural snarling grew softer and fainter as Jackdaw forced himself to keep his jaws firmly clasped upon her windpipe, eyes clenched shut. A few moments felt like an eternity before the she-wolf let out one last gurgling huff and went limp in her mate's jaws. Growling to keep back tears, Jackdaw gently released his grip and laid her down on the earth at his feet, just as his half-brother- Gringo and pups showed up behind him, the pups having convinced gullible Gringo to take them out of camp to search for them.
Aaannnnnd dramatic cliff-hanger dun dun DUUNNN. (Lol I actually haven't come up with anything to happen after that yet, so yeah. XD)