The new arrival, born during the coronavirus lockdown, was aptly christened 'Lockie' - much to the widespread approval of the public.
Lockie's mother, Honeybee, was a rescue donkey who came into the care of the Sanctuary already in foal.
On April 7, Honeybee was examined by the Sanctuary's Head of Veterinary Services, Laurence O’Sullivan, who suspected that the foal's birth was imminent.
On Easter Monday, Declan Sexton, the Donkey Sanctuary Ireland's Head of Farms, kept a close eye on the expectant mother, ensuring she was comfortable.
That evening, when he went to put Honeybee into her barn for the night, Mr Sexton noticed a dark shape standing behind her.
It was a foal. The foal was still wet and had been born within the last hour or two.
Both foal and mother were examined by vet nurse Therese Riordan, who found that the two were in good health.
"Lockie is thriving, he is full of beans and loves to bound around," Mr Sexton said.
"He is still a little shy, but that is to be expected at this stage as he gets used to us.
"Honeybee is a great mother. She is very protective of her foal and shields him at all times.
"It is a joy to see the relationship of mare and foal grow as the days go by."
"The Donkey Sanctuary has a no breeding policy, but all foals born into our care are guaranteed a home for life, either here at our sanctuary or in one of our Guardian Homes," he continued.
On social media, the public was quick to admire the new colt foal.
"Lucky little foal. Love to you all. God bless you all for your fantastic work," one person wrote, whilst another added, "such a blessing... love the name too, made me chuckle."
Due to the Covid-19 outbreak, the Sanctuary's Open Farm in Liscarroll is currently closed to members of the public and office-based staff.
However, donkey-facing staff continue to work and provide the highest level of care and welfare to resident donkeys and mules.