Sadly, a handful of cats meet their untimely end throughout the series. Avoid Issue #5: The Gathering Storm, Issue #6: Lost, and Issue #14: What the Cat Dragged in. Fake-out deaths involving cats are also present in Issue #3: Let Sleeping Dogs Lie and Issue #7: Something Whiskered this Way Comes.
Thankfully, no dogs are pitted against each other for sport, though the protagonists more often than not have to engage in melee combat with one or more aggressive entities-- sometimes other dogs.
In Issue #6: Lost, a mother dog who discovered several deceased young animals-- including her own pups-- commits suicide by plunging herself into the waters to be with them and provide their spirits the motherly comfort that was stolen from them.
Not inherently sexual, but in Issue #2: The Unfamiliar, a supernatural being with a humanoid body appears, sporting a pair of bare breasts. The naked figure appears again in Issue #14: What the Cat Dragged in. Later, in Issue #10: Food Run, a goblin-like critter is featured that bears a tiny intact penis. All of it rather harmless though.
In Issue #6: Lost, not only are several young animals' corpses shown, but the human teen that abducts, tortures, mutilates, and eventually drowns the infant pets is killed by the protagonists. (As he deserved.) In Issue #14: What the Cat Dragged in, a cat's adolescent children pass away while dissipating into skeletons after being freed from a curse keeping them alive.
Fire spells are a staple of the series, and are often used in fight sequences. In addition, "The View From The Hill" focuses on a herd of sheep who died in a fire.
Several characters experience trauma and anxiety throughout the series, though none so much as Jack, who becomes faint and paralyzed in one instance, alongside frequent and recurring nightmares.