Timothy syndrome is a rare neurodevelopmental disorder caused by a mutation of the CACNA1C gene, with nearly 80 percent of diagnosed cases leading to fatal heart conditions in early childhood, according to the Cleveland Clinic.

The fewer than 100 people worldwide suffering from Timothy syndrome are at risk of irregular heart function, seizures, trouble communicating, and developmental delays. One of them is two-year-old Patrick Bresnahan of New York.

The boy’s nurse mother is managing his condition, which has no cure, by acquiring a $25,000 service dog. The money came from kind-hearted donors.

Patrick’s interaction with the golden retriever named Yammy produced results within the first two weeks they were together, as “he was doing 12 new things he had never done,” his mom told Fox News.

Yammy has also increased her son’s social ability and self-confidence. The toddler began walking, running, and moving much more easily and smoothly and started climbing steps, which he had never attempted before, Susan recalled, according to Fox News.

Meanwhile, a plane passenger was not happy encountering another service dog aboard a United Airlines flight.

The Denver-bound commuter ranted about a big dog occupying his plane seat in a recent post on the American online forum Reddit, the New York Post (NYP) reports.

After the flight attendant simply shrugged off the furry occupier, the man tried to resolve the issue with the dog’s owner. But the giant pooch would not fit under the seat, he related in the post that had gone viral.

Worried about getting bumped from the flight, the displaced passenger was forced to take another seat.

“It’s totally absurd that an oversized dog can displace a paying passenger from their seat,” the flyer fumed in the Reddit post, according to the NYP. “How can someone be allowed onboard with a dog that big without buying an extra seat?”