A horse trapped in a slurry pit being rescued by fire crew—Photo: PA

A survey of fire services across the UK has revealed the dozens of species that have required the aid of crews. Firefighters have been involved in 10,726 animal rescues over the past two years, at a cost of £8.5 million. (18 Oct 2009)

More numbers:
cats: 2,826 call-outs
dogs: 2,277
birds: 2,049 (108 seagulls!)
horses: 1,909
cattle: 955
deer: 244
foxes: 34
squirrels: 21
18 hamsters
badgers and hedgehogs: 10 each
seals: 9
whales: at least 4
dolphins: 4
gerbils, chinchillas and iguanas: 3 each
otter: 1

Other animals: ferrets, rabbits, guinea pigs, a rat, a boa, a buffalo, a raccoon, and even 2 fish!

Dogs often became stuck in household appliances, while cats generally became trapped in trees. Some rescues required lots of equipment, while others were easier:

When firefighters from the Royal Berkshire Fire & Rescue Service were called to an address in Tilehurst, Reading, to assist a squirrel stuck on a roof, their log recorded simply: “Persuaded down by brigade. 1 hour.”

[ Read the whole article for information about costs and other rescue details ]

Morris needed rescuing by firefighters [crews from Partridge Green, Storrington and Worthing] after pitching off owner Laura Bigwood before sliding into the muddy hole in the ground. After narrowly avoiding being crushed or drowned, she dialled 999 as she saw Morris was stuck. He then spent an undignified hour on his back, legs pointing skywards, as firefighters used heavy lifting gear to extract him. (April 15, 2009) —Photo: INS

[ Source ]

Firefighters came to the rescue of a horse that was trapped on a river embankment in Carrington. The fire service’s water incident rescue boat was used to reach the animal, at the North Equestrian Riding Centre. (March 31, 2009) —Photo credit not given in article

[ Source ]

VAIL, Colorado—Firefighters in Vail, Colorado rescued a horse trapped in an upended trailer Monday morning on eastbound Interstate 70 after a one-vehicle accident…. The trailer had become separated from a 2000 Ford truck traveling from Rifle to southern Mexico after a blown tire caused the vehicle to start fish tailing. The trailer was tipped over on its rear with the hitch in the air and the horse inside when rescuers arrived on the scene. With the help of Eagle veterinarian Sylvia Stocker, rescue teams removed the horse from the trailer by cutting a flap out on the roof. The horse was able to walk out on its own. (March 23, 2009) —Photo: Special to the Vail Daily

[ Source ]

Foal in the Hole: It took nearly a dozen Marion County Fire Rescue firefighters an hour and 12 minutes to free Shooter from 2 to 3 feet of foul water in a septic tank. (March 2008) —Photo Judge Cochran/AP

[ Source - which includes a hilarious shot of the foal's face ]

A firefighter comforts Pencil, a horse that fell through the ice on a pond on Doug Oldiges’ farm in Melbourne, Ky, on Wednesday Feb. 4, 2009. Firefighters and members of the Northern Kentucky Large Animal Rescue Team rescued Pencil with plywood and slings to pull him out of the ice. (AP Photo/The Cincinnati Enquirer, Patrick Reddy)

[ Source - with a set of 6 pictures of the rescue | Update: Another article with more pictures ]