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.
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A dry start with long sunny spells. Cloud will thicken during the afternoon.
Sunshine in the north this evening, but cloudy in the south.
Hundreds of people gathered in Cardiff for International Yoga Day. Young and old came together to learn about the ancient Indian discipline