The Dogs Trust in Bridgend says over 600 dogs arrived at the centre last year - a record high.
Staff believe the struggling economy has played a part, but added many people simply don't realise the time and money needed to care properly for a pet.
They have urged would-be owners to think long and hard before committing to a dog.
More top news
I think it is fair to say that Autumn seems rather keen to get going. It certainly feels like it out there, with chilly nights this week!
It's almost time for the Rugby World Cup - here's how ITV Cymru Wales will be bringing you all the action.
RSPCA says one budgie was put to sleep and another survived after their cage was left in a road in Swansea. A pet snake was also left.