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How Much Does a Dog’s Breed Affect Its Health and Behavior?

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How Much Does a Dog’s Breed Affect Its Health and Behavior?

In some cases, these health problems arose as byproducts of inbreeding. Because breeds are genetically closed populations, a disease-causing mutation that just happens to pop up in one dog can quickly become common in future generations. “Especially if the animal with that mutation is otherwise a prize specimen,” Dr. Serpell said. “Because everyone will want to breed from that individual.”

The result is that many modern breeds suffer from ailments that dog lovers never would have deliberately selected for. Labrador retrievers are prone to a degenerative eye disease known as progressive retinal atrophy, while Cavalier King Charles spaniels often develop a heart condition called mitral valve disease.

Credit…YAY Media, via Alamy

In other cases, however, the physical traits that breeders are seeking can themselves be the problem, especially as these characteristics have become increasingly exaggerated. The breed standard for bulldogs explicitly calls for “very short” muzzles, but, over time, the dogs’ snouts have all but disappeared, Dr. Serpell said, resulting in serious respiratory problems.

Mutts and mixed-breed dogs can be healthier than purebred ones, especially if they have small amounts of DNA from many different types of breeds, Dr. Bannasch said.

But some mixed-breed dogs may still be highly inbred, she said, and some health problems are common in multiple breeds. Many large breeds are prone to bone cancer, for instance; mixing a few of them together may not have much benefit. “You can’t lump all ‘mixed breeds’ together,” she said.

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In creating modern breeds, humans generally put a much stronger emphasis on appearance than behavior, which is also shaped by a dog’s training and early environment.

“Behavioral traits definitely vary from breed to breed, but not nearly as strongly as the morphological traits do,” Dr. Boyko said. “You’re never going to get a collie that looks like a Great Dane,” he added. “But I see lots of dogs exhibit pointing behavior that aren’t pointers.”

Scientists have uncovered some general patterns. Terriers, which were bred to hunt and kill pests, are more likely to exhibit “predatory chasing” than herding dogs, for example. And, on average, Siberian huskies are more likely to howl than Labrador retrievers are.

Credit…Life on White/Alamy

But, overall, breed is a poor predictor of behavior, and there is more variation within breeds than between them, scientists have found. Someone who wants a friendly, fetch-loving dog that doesn’t bark can’t bank on getting exactly that just by bringing home a Labrador retriever. “You may get exactly the opposite of that,” Dr. Lord said.

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Video: Crowds Flood New York City Streets for First Day of Manhattanhenge

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Video: Crowds Flood New York City Streets for First Day of Manhattanhenge

new video loaded: Crowds Flood New York City Streets for First Day of Manhattanhenge

People filled the streets of New York on Thursday to get a glimpse of this year’s first Manhattanhenge. The spectacular view of the sun setting, flanked by the city’s streetscapes, will also occur on Friday and July 11 and 12.

By James McManagan

May 29, 2026

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Oxnard man smuggled baby crocodiles, among 1,700 reptiles, gets 5 years

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Oxnard man smuggled baby crocodiles, among 1,700 reptiles, gets 5 years

An Oxnard man has been sentenced to more than five years in prison for smuggling at least 1,700 reptiles worth more than $739,000 into the U.S. over six years, the U.S. Department of Justice announced Friday.

The animals, including baby crocodiles and Yucatán box turtles, were bought and sold over social media and came from Mexico, Hong Kong and elsewhere, an investigation led by the U.S. Fish and Wildlife Service revealed.

From January 2016 to February 2022, Perez and co-conspirators brought in wild animals without the permits required by the Convention on International Trade in Endangered Species of Wild Fauna and Flora — and without declaring them, the Justice Department said.

In August 2022, Jose Manuel Perez pleaded guilty in federal court to one count of smuggling goods into the country and one count of wildlife trafficking.

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The animals smuggled from Mexico were advertised on social media, with defendants posting photos and videos of the reptiles being captured in the wild.

People working with Perez would collect the reptiles including Mexican box turtles and Mexican beaded lizards, at from an airport in Ciudad Juárez, then move them by car over the border to El Paso.

According to federal authorities, Perez paid people a “crossing fee” each time they traversed the border. Payment depended on how many animals they trafficked, the size of the package and the level of risk they faced.

Sometimes Perez and another person would traveled to Mexico to buy animals taken from the wild to smuggle into the U.S. Once shipped, they were transported to Perez’s home, in Missouri and then California after he moved there.

When the sentence came down, Perez was already serving nine years for felony possession of firearms. Due to convictions in Ventura County Superior Court for “street terrorism” and assault with a deadly weapon, he is not allowed to have firearms, the department said.

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According to the San Diego Zoo Wildlife Alliance, illegal wildlife trafficking is the second-largest threat to species after habitat loss and the world’s fourth-most-lucrative trafficking industry.

“Illegal wildlife trafficking not only diminishes the populations of targeted wildlife species, it also impacts related species, their interconnected ecosystem, local and global economies, and has the potential to impact the health of people through zoonotic disease transmission,” the alliance says on its website.

Reptiles get caught in the fray. Earlier this month, the Justice Department announced that a Daly City man suspected of purchasing and exporting hundreds of poached turtles from Florida was facing federal wildlife trafficking charges.

The U.S. attorney’s office for the Southern District of California and a section of the Justice Department’s Environment and Natural Resources Division, along with U.S. Customs and Border Protection and Homeland Security Investigations, assisted federal wildlife officials with the investigation into Perez’s dealings. The case was prosecuted in U.S. District Court for the Central District of California.

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Video: Blue Origin Rocket Explodes on Florida Launchpad

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Video: Blue Origin Rocket Explodes on Florida Launchpad

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Blue Origin Rocket Explodes on Florida Launchpad

A rocket built by the Jeff Bezos-owned space company, Blue Origin, blew up during a test at the Cape Canaveral Space Force Station in Florida.

“Oh, no, that’s an explosion.” (explosion erupts) “That is crazy.” “What?” “Oh, my God!”

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A rocket built by the Jeff Bezos-owned space company, Blue Origin, blew up during a test at the Cape Canaveral Space Force Station in Florida.

By Nailah Morgan

May 29, 2026

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