If you know a couple that’s having trouble trying to conceive, their couch could be part of the problem. Or their shower curtain. Or any number of other household items, depending on what they’re made of. New research by scientists at the University of Nottingham (UNOT) in Nottingham, England suggests that common chemicals and environmental contaminants found in the home could be causing infertility in men—and in male dogs, too.

This week: One day soon, your dog could be tucking into a bowl of Kibbles ’n . . . Tusks? Plus, feeding a stray cat costs a Florida woman $48,000, and eating human food could cause premature aging in bears.

Usually, scientists discover cures for human health conditions by testing them on animals. This time, it’s the other way around. In a refreshing change of pace, a veterinary cardiologist and her colleagues have discovered a way to cure a rare but life-threatening heart arrhythmia in dogs by adapting a treatment pioneered in humans.

Dogs’ personalities can change to reflect similar changes in their owners. Which means your midlife crisis could have life-changing consequences for your dog. “When humans go through big changes in life, their personality traits can change," said William Chopik, PhD, MS, an assistant professor of psychology at Michigan State University. "We found that this also happens with dogs—and to a surprisingly large degree.”

Originally from East Asia, the longhorned tick, or Haemaphysalis longicornis, successfully established itself in other areas of the world, including Australia, New Zealand, and, as of last November, eight states in the US, mostly in the East. These little guys get around. But where are they going next?

It depends on what you mean by smart. A new study published in Animal Cognition indicates that bigger dogs, who have larger brains than smaller dogs, perform better than smaller dogs on some measures of intelligence. Specifically, bigger dogs with bigger brains do better on a specific type of intelligence called “executive functioning,” which is linked to self-control in both humans and canines.

This week: Unhand that hedgehog! Plus, animal-free cosmetic testing closer to reality, and you might want to double check your dog’s cremains.

Aggression, disobedience, repeatedly running away, and too much barking can doom dogs to an early death, according to a new study by researchers in the UKat the University of London Royal Veterinary College’s (RVC) VetCompass program. Per the report, one-third of dogs in the UK who die before the age of three die because of “undesirable behaviors” (UBs)—many by euthanasia.

Things are moving fast in the world of feline pathogens. The authors of a recent review article in the Journal of Feline Medicine and Surgery say “the rate at which novel [or previously unknown] viruses are being discovered now exceeds our understanding of their clinical relevance.” And it’s not just happening to cats: A 2008 paper in Nature described the discovery of 335 infectious diseases in the global human population between 1940 and 2004.

When we think of certain dog breeds, specific characteristics come to mind: Beagles are boisterous. Afghans are aloof. Pembroke Welsh Corgis are sycophantic and suck up to royalty (not really). But it’s well documented that different breeds have different personalities. Are those differences determined by DNA?