The Dublin SPCA has said today's Smithfield Market horse fair poses a major health and safety risk for the animals involved and members of the public.
The animal welfare organisation is calling for the traditional fair to be suspended following the announcement that Dublin City Council construction works will halve the space available for the event.
Up to 400 horses are expected to be brought to the Smithfield horse fair today.
Operations manger with the Dublin Society of Prevention to Cruelty to Animals Orla Aungier said: "Everything about that location is unsuitable", listing the steel street furniture, the glass-fronted buildings, the surface of the ground, the Luas line running through the area and the large numbers of people walking through it.
"The animals do get frightened. We've seen horses break loose and do significant damage...It's a miracle somebody hasn't been killed at this market."