An Adelaide couple has experienced overnight Instagram fame after a video of their pet alpaca Alfie went viral online.

Key points: Alfie the alpaca has almost 200,000 followers on Instagram

Alfie the alpaca has almost 200,000 followers on Instagram He grazes outside during the day and sleeps inside at night

He grazes outside during the day and sleeps inside at night His owners say he has become a celebrity online and in their local community

When they shared a video of Alfie on an Instagram page they created for their pet, it gained an additional 50,000 followers in just 24 hours.

Alfie's owner Jeff Cheng said his one-year-old alpaca now had more than 182,000 followers from all around the world.

"It was a pretty big surprise to us because we were just using Instagram so we wouldn't flood our own personal Facebook feeds with photos of an alpaca," Mr Cheng said.

"It was just somewhere to put all his photos and it has kind of just taken off, everyone seems to like animals with big, round, fluffy heads."

Mr Cheng said Alfie grazes outside during the day and sleeps inside at night. ( ABC News: Sarah Mullins )

Alfie has been living with Mr Cheng and his wife in their suburban Warradale home in Adelaide's south-west for the past five months.

The domesticated animal grazes outside in their backyard during the day but sleeps inside in the lounge room at night.

"He has been a dream, he has toilet-trained himself and he has attached himself to us, he's very easy going," Mr Cheng said.

"We usually go for a walk after work, and then he will come back home and want to hang out with us in the evening, so we all watch TV together."

Along with the online world, the local Warradale community has come to know Alfie well in recent months.

Alfie is taken for a walk. ( ABC News: Sarah Mullins )

Mr Cheng said their neighbours would greet Alfie during his daily walk to the park.

"We were kind of homebodies, my wife and I, and now we know all the neighbours and the neighbourhood kids," Mr Cheng said.

Alfie lives with Mr Cheng and his wife in their Adelaide home. ( ABC News: Sarah Mullins )

The viral video, which shows Alfie running through his favourite park in Adelaide, has been viewed more than 15 million times online.

The couple said they had received messages about Alfie from all over the world.

"It has mostly been positive, we have had a couple of alpaca people reach out and say that it's not ideal having only one alpaca in a domestic environment because they are herd animals," he said.

"But we have spoken to several other single alpaca people that have them as pets and they all seem to be fine, they all seem to be happy, they don't get depressed.