Rescue pup Butterball is twice size of his siblings
This is Butterball - the biggest puppy to arrive at Dogs Trust Ballymena since the rescue centre opened in 1970.
The giant pup is just 11 weeks old, but towers over his siblings.
Staff at the rescue centre were dumbfounded when the crossbreed arrived over Christmas.
He has now grown to weigh a whopping 7kg, which is 3kg more than a similar aged dog, and double the size of his brother and sisters.
Butterball was brought to the rescue centre after he and the rest of his litter were found abandoned in a field.
Experts at Dogs Trust believe Butterball and siblings Rosebud and Mudbud are Rottweiler-cross border collies, but they cannot account for the former's unusual size.
Dogs Trust Ballymena's rehoming manager Sarah Park said: "All of us at Dogs Trust cannot believe the size of Butterball.
"He's a gigantic ball of fluff who is just ginormous compared to his siblings, who are both the exact same age and breed as Butterball. He's such a wonderful dog. He's super friendly and fun.
"He does throw his weight around from time to time and lets all the other puppies know who is boss, but he loves to please, and as you can probably tell, he loves his food." Dogs Trust veterinary surgeon Ariel Brunn said that Butterball's size appeared to be down to his breeding rather than because of any underlying medical problem.
"Butterball is obviously much greater in size than his siblings," she added. "He's much taller, longer and fluffier, but we believe this is simply down to his genes. He may have inherited more of the rottie genes from his parents, and has beautiful thick hair."
Butterball has already found his forever home, but staff say there are plenty of dogs still looking for a place to live at Dogs Trust Ballymena, which cares for up to 60 dogs at any one time.
Dogs Trust is currently home to 33 puppies of all shapes and sizes, many of which were handed in over and after the Christmas period.
It is the UK's largest dog welfare charity and cares for nearly 17,000 dogs each year through its network of 20 rehoming centres across the UK and one in Dublin.
If you’re interested in rehoming a Dogs Trust dog, contact the Rehoming Centre on 0300 303 292.