Coopers issued a statement to say no animals were in the building at the time of the fire.
East Sussex Fire Service responded to the incident at 6.35pm on Sunday (September 20) with four appliances and a turn-table ladder initially on the scene. This was upgraded to eight appliances by 8pm.
Firemen using six breathing apparatus fought the fire externally with four main jets and two hose reel jets. The aerial water tower was also used. Firefighters entered the building at 10pm to tackle the fire.
They were still on the scene at 1am.
Thick plumes of smoke could be seen from the Ridge, across the town.
Coopers, in a statement, said: “We are sad to say the fire was at the practice. All appointments will be cancelled for the foreseeable future and all emergencies will be diverted to Claremont Vets on 01424 222835. No animals were in the building at the time. Please bear with us at this difficult time.”
Coopers was inundated with messages of support and offers of help, including from nearby RSPCA Bluebell Ridge cat re-homing centre. Other vets in the area were also quick to offer help and support.
Coopers said: "We would like to extend our heartfelt thanks to East Sussex Fire and Rescue Service and the South East Coast Ambulance Service for their swift response. and support.
"We are also incredibly grateful everyone who has offered their help, kindness and support during this difficult time.
"We appreciate your patience and understanding while we work through the situation and get back to our clients.”
A spokesperson for East Sussex Fire and Rescue Service said the cause of the fire was ‘undetermined’ An investigation is now underway.
1. Screenshot
The fire at Coopers Vets in Hastings on Sunday evening. Pic by Cllr Peter Clarke Photo: Cllr Peter Clarke
2. Screenshot
Coopers Vets at Hastings after Sunday's fire Photo: Cllr Doreena Ross