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As every dog owner knows, it doesn't take much to get our furry friends excited. Whether it's post dropping through the door, owners coming home from work, or just the word "walk", they're super enthusiastic about almost anything.

A series of photographs has given an insight into the variety of things which get dogs' hearts racing through an innovative camera system. The pictures posted to Instagram were taken using a system developed by camera producer Nikon, which operates by attaching a camera to a dog and taking a photo every time its heart rate rose.

The photos were taken by a sheepdog called Grizzler, and were posted on Instagram by thishowthingswork with the caption: "This dog wore a camera that snaps photos whenever its heart rate jumped due to excitement, and the results are fantastic!"

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The post description reads: "The system was developed by Nikon and is called Heartography, a new technology that combines a heart rate monitor with a camera. When the monitor detects a surge of excitement or even fear, it automatically triggers the shutter, freezing that exact moment in time without any human input.

"The idea works perfectly for a dog like Grizzler, who gets excited about nearly everything around him. Walks, people, smells, and surprises all send his heart rate soaring.

"During early tests, Grizzler wore the camera throughout his day, unknowingly capturing moments only a dog could notice."

The pictures show other happy dogs coming to say hello to Grizzler, as well as his food bowl, and some other more surprising things, including a tank full of crabs, and a turtle paddling by the edge of a stream, lake, or river.

And a few others show something that gets every dog worked up - cats peering out from between plant pots, out of a window, and under a stack of chairs.

Grizzler was also apparently excited to see a pigeon approaching what looks like a pile of crumbs on a crisp packet, and a car boot filled with boxes marked 'Mazola corn oil' and tins of Heinz baked beans.

Photography website PetaPixel explained more about how the Heartography system worked. "The mount system features two sides: the heart rate collar and the special camera case," it said.

"The collar is worn around the dog’s neck, monitors its heart rate, and constantly sends the number to the camera case wirelessly. The camera case displays the current heart rate on an OLED screen.

"Buttons next to the display let you choose the baseline heart rate that triggers photos. Whenever the dog photographer’s heart rate goes above the threshold - indicating a spike in emotions and/or activity - the case will snap a photo with the Nikon compact camera contained within."

Instagram users were amazed by the pictures. One said: "Love how he got happy an excited seeing all his pals!!"

Another said: "Food and animals. I can relate." Someone else wrote: "Corn oil and baked beans will increase anything’s heart rate."