A tennis ball-obsessed dog got himself into a spot of bother after taking his hobby too far and swallowing two balls whole, leaving him needing life-saving surgery.

Loki, a five-year-old crossbreed, landed himself in trouble after a game of fetch with his loving owner Amy, ended in disaster and an emergency trip to a PDSA Pet Hospital.

Amy explained: "Loki is a high-energy dog and he loves nothing more than a game of fetch. Most of his toys are the 'super strong' ones - he's a gentle giant, but his toys don't last long if they aren't tough ones. But his favourites are tennis balls, he's obsessed.

"It was only when Loki refused to eat, and started being sick, we realised something was wrong. He was still active and playful, but it's not like Loki to pass up some food! When the sickness didn't stop we called PDSA, and they told us to bring him straight in for an appointment."

Luckily for Loki, the charity's Midlands team acted fast and an x-ray revealed the problem: two whole balls inside his stomach.

PDSA Vet Catherine Burke said: "Our vet teams treat ball related injuries every year, which can quickly turn into a life threatening situation. Loki's situation was a case of life-or-death - without surgery, he would likely have died. One of the balls was lodged in his stomach, preventing him from keeping food down.

Loki was taken into theatre and his emergency operation was a success; PDSA's vets managed to remove both balls intact.

The two tennis balls lodged in the dog's stomach. (Photo: PDSA)

But the charity is using Loki's story to warn other owners that a bit of innocent fun with a tennis ball can quickly turn into a life-threatening situation. It's best all round to trade out the tennis balls for safer toys.

Catherine added: "If your dog loves to chew, there is also the risk they could swallow chewed up parts of the tennis ball; which can still cause the same issues with gut blockage like in Loki's case."

Following the surgery, Loki is recovering well and, according to Amy, he is back to his fun, playful self.

It's not unusual to see dogs running after and catching tennis balls. In particular at this time of year, with Wimbledon in full swing, tennis lovers may wish to play a game of fetch with their four-legged friends.

Catherine shares some of the dangers associated with tennis balls: "If your dog is a tennis ball enthusiast, they may not wish to part with their beloved toy, however there are a few important reasons they are not the best option for dogs, quite apart from the fact that they won't last long under most dog's jaws.

"The size of tennis balls, and the way they bounce, means that there is a risk the ball can get stuck at the back of your dog's throat, causing them to choke. It can become wedged in position too far in for you to remove it, blocking your dog's airway, which sadly can be fatal if the ball can't be removed quickly.

"If this does happen, try to keep calm and if safe to do so, you can attempt to remove it from the back of the mouth. However it can be very slippery and difficult to remove. If you can't remove it, contact your vet immediately for an emergency appointment.

"Tennis balls are covered in a felt layer; which has the appearance of yellow-green fuzz and is abrasive which means it has a sandpaper-like effect. Over time it can wear down your dog's teeth and cause pain and difficulty chewing."

Instead of tennis balls, PDSA recommends toys and balls specifically designed for dogs, as these are less likely to fall apart when chewed. Make sure any ball you choose is the right size for your dog, to avoid potentially fatal choking incidents or intestinal blockage - they should be big enough to be grabbed with the teeth and carried, but not fit perfectly in the mouth.

Depending on the kind of activity your dog enjoys doing, here's a guide to the best toy to match:

• Tugging: rope toys and rubber rings are great for tugging games.
• Retrieving: Balls of a safe size that they can't choke on.
• Searching: hide their kibble or treats in snuffle mats.