Diane Duffield, 34, is deaf in her right ear and has only 30 per cent hearing in her left.
But thanks to hearing dog Joey, she is alerted to any doorbells, fire alarms or danger by Joey putting her paws up on her knees.
His help also means the mum-of-two of Lawn Close, Rowner, can teach kids at Steady Steps Pre-School in Gosport.
'I can hear voices with my hearing aid but sometimes things crop up like the taps were running in the class,' she said. 'The children get excited about Joey but they know that when she's got her jacket on she's working.'
Mrs Duffield's deafness was first noticed when she was 16. It is not known what caused it but it has gradually worsened over time.
Joey has been helping her since last March after the dog received months of training from charity Hearing Dogs for Deaf People.
Despite her deafness, Mrs Duffield leads a full life.
She's been married to husband Carl, 34, for 11 years and is a parent governor at both Rowner Infants and Juniors where her children Kieron, nine, and Harrison, five, are pupils.
As well as her work at Steady Steps she is also studying for an NVQ in childcare at St Vincent College in Gosport.
She said: 'It's a hidden disability.
'A lot of people don't realise I'm deaf because I'm young, I speak clearly and my hair covers my hearing aid.
'Deafness affects people of all ages but you can lead a very full life.'
The children and staff at the pre-school in Copse Lane, Rowner, think she does a wonderful job.
Pre-school supervisor Julie Pickthall said: 'Her deafness doesn't affect her work, she's one of the good ones.
'The children have reacted very well and have all just accepted her and Joey.'