Last August, a 31-year-old man in South Bend, Indiana, beat his father's small terrier dog to death — with a boat oar.

The perpetrator, Joshua T. Prior, was caught by authorities seven blocks from his family's home and charged with a number of crimes including killing a domestic animal, a felony.

Prior had a history of violence: He previously served jail time for battery, according to a local news station. "We take these things very seriously, as everyone should," Captain Phil Trent of the South Bend Police Department said after the arrest. "Because when you have something like this occur [the violent death of the dog], it's only a very short trip to something like this happening to a person."

76 percent of animal abusers also abuse a family member, according to The Spot Abuse Project, a campaign launched in May 2014 in Milwaukee, Wisconsin, to encourage people to call 911 when they think there is animal abuse taking place in a home. YouTube/spotabuse

Cases like this occur across the country on any given day: A woman in New York is assaulted by her boyfriend and her dog is shot. An 18-year-old female burns and stomps a tortoise to death in Florida, and is also charged with sexual misconduct in another case. A former mayor being investigated for child pornography was charged for torturing cats on camera. A man who killed his German shepherd was eventually charged for killing his mother.

One man, Randall Lockwood, senior vice president of forensic sciences and anti-cruelty projects at the American Society for the Prevention of Cruelty to Animals (ASPCA), has been studying the link between violence against animals and people for more than 30 years. In fact, he has written a number of books on the subject, including "Cruelty to Animals and Interpersonal Violence," "Animal Cruelty Prosecution: Opportunities for Early Response to Crime and Interpersonal Violence" and "Dogfighting Toolkit for Law Enforcement: Addressing Dogfighting in Your Community."

The Dodo asked Lockwood about his most recent research regarding the link between violence against animals and people — a link that is becoming increasingly clear to animal welfare advocates, academics and law enforcement circles alike.

You have said that animal abuse doesn't happen in isolation and wherever, say, a family pet is being abused, it is likely that a family member is also a victim of abuse. When did you first come to make that connection and why?

It wasn't a single incident. The ASPCA has been building an awareness of the connection between animal cruelty and violence in many ways. My first opportunity looking at this was more than 30 years ago, recognizing the role of pets within families that had a history of child abuse and neglect.

What we saw is that in families where there was a history of physical abuse in children, animal abuse was present prior to that or concurrent to that in 90 percent of the families researched.

Subsequently, the other big area where the connection between animal and human violence is very strong is in the connection between animal cruelty and domestic violence: 70 percent of pet-owning women seeking shelter report that a pet has been threatened, injured or killed by their abuser. About half of those women report their pets have been harmed and that their children have often witnessed that abuse.

We are seeing recognition of this connection: In 30 states, it is now possible to get protection for a pet in a domestic violence situation.

Stephen Sylvester, 18, was fatally beaten by his boyfriend, Bryan Canchola, 20, in July 2015. Canchola also strangled Sylvester's terrier, Harlow. The dog was found by a responding officer, hemorrhaging, but alive.

What are the steps to get protection for a pet in instances of domestic violence?

It depends on the state. The procedure would be the same as getting a regular order or protection — you would just include your pet in the document.

[In essence, violence against pets] is considered psychological abuse toward the person who loves the pet. And most of these new laws have come about in the last five or six years: Legislators were not made aware of the need until then.

Batterers often kill and abuse pets to orchestrate fear, violence and retribution in homes marked by domestic violence, according to a community toolkit created by the ASPCA and the National Link Coalition. How does this abuse actually play out in the home?

It might first start in [the form] of threats. Animal cruelty, like domestic violence, is about power and control. So, a lot of the animal cruelty we see in domestic violence situations can involve threats to harm an animal if an abuser doesn't get his way. Or [an abuser might] harm the animal to demonstrate the ability to cause harm. If a domestic violence victim has been choked, we can see [in some cases] that a cat was also choked to death. If the victim is being beaten, we [have seen] beatings of cats and dogs.

Unfortunately, a common circumstance is that if a victim of abuse must leave a situation, the pet might be left behind and the animal is often abused or killed. This is sometimes why a victim might not leave an abusive situation [and] why we are supportive of shelters accepting victims who own pets. There are only approximately 100 shelters in the country that offer co-sheltering. But, we've seen the growth of these co-housing programs. One in New York City, called URIPALS, has been around for one year or so.

Two-year-old Charley was found cut in half on a Louisiana golf course in August 2015. His death has spawned a number of positive law enforcement changes, Jeff Dorson, of the Humane Society of Louisiana, told The Dodo. Humane Society of Louisiana

The history of child protection is rooted in animal welfare organizations, correct?

Yes. In fact, ASPCA founder Henry Bergh was one of the founders of the Society for the Prevention of Cruelty to Children (SPCC). There is a longstanding recognition that violence is violence and perpetrators cut across lines.

You talk about a "nation of silos" — that in many communities there is, unfortunately, minimal communication between animal, child, domestic violence or eldercare protective services. Can you expound on this problem?

A lot of my work involves this. We are seeing more and more cooperation but part of it is that everyone is overworked: The caseload for child protection services, the caseload for domestic violence responders and the caseload for animal cruelty officers is overwhelming. In the past, there was no recognition of overlap.

However, when you sit these people down to share stories and data, you realize you are dealing with the same offenders.

Are there parallel crimes committed against animals and people?

In domestic violence, most of the injuries we see against animals are the same against the person: blunt force trauma, beatings. We occasionally see stabbings. For other offenses — perhaps with high risk of committing crimes against people — we see the use of fire, especially young offenders setting animals on fire. Unfortunately, we have quite a few cases of animals that are burned and that is a serious warning sign.

In April 2015, Janice Susan Deutsch, 50, was sentenced to four years in prison for animal cruelty by a court in California for systematically starving 17 horses. Facebook/All Horses Go To Heaven

Are you able to determine if violence against animals is on the rise?

No. We cannot determine that. We can therefore try to get information on a local basis.

But it's unclear if the actual incidences are on the rise, or the police response is on the rise, or the reportage of [violence is on the rise]. We recently trained the New York City Police Department, and [the ASPCA is] seeing more animal cruelty cases come to us, but it will take us a while to see what the trends are. But your question is the question I get asked the most, and the awareness of it on all levels by the public, law enforcement and the legal system shows the greater appreciation of the link between violence against people and animals.

What are the demographics of the violence link?

In regards to intimate partner violence, if you look at serious abuse, such as beatings, stabbings or shootings, men are more prominently represented. These men are usually younger to middle-aged men.

If an animal has been bludgeoned on the street, it is probably [committed by] one or two male offenders. If an animal has been poisoned, that might be [a] different [case].

The flip side is one of the forms of animal cruelty that produces suffering and death: animal hoarding. Animal hoarding is more common among women and particularly older women. Now, although they aren't abusing the animals, they are slowly starving or neglecting sometimes hundreds of animals.

But there are no absolutes: We have couples who are hoarders. We see young women involved in intentional violent acts, and although it isn't common, they do happen.

Altogether, though, in 95 percent of the cases of intentional abuse, we are looking for young male offenders.

Can you point to a state group that is excelling at both recognizing the link between people and violence and providing services?

Yes. One of the best is The Colorado Link Project. Also, Colorado has mandated reporting of animal cruelty by veterinarians.

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To learn more about the link between violence against people and animals, and read many other cases of pet abuse or murder, please go to the National Link Coalition.

Watch the full Spot Abuse PSA below: