If you have a visual impairment, the use of a guide dog is pretty much the norm. But a small charity in Sheffield, Support Dogs has recently begun to train dogs to help people with epilepsy.
Gillian McClusky is 39. She's had seizures since she was a tiny baby, with medication having little or no effect. She experienced several attacks a day - until Harvey - a small jet black mongrel with a white moustache - came into her life.
Felicity Finch went to Dorking in Surrey to meet Harvey and Gillian. Further Information: Support Dogs, The John Fisher Centre, Trianco House, Thorncliffe Park Estate, Chapletown, Sheffield S35 2PH. Training Centre: 0114 257 7997 or call BBC Actionline on 0800 044 044