Beverley Price from Bridgend Dogs Trust says 600 dogs arrived at the centre last year - a record number.
She urges anyone considering getting a dog to think long and hard about their decision - and is asking would-be dog owners to consider rehoming a dog from the centre.
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The incident involving three vehicles happened on the eastbound between Cardiff Gate and Tredegar Park.
Ahead of a meeting of ministers from Britain and Ireland, the Welsh and Scottish First Ministers join forces to urge a Brexit rethink
Negative perceptions of the south Wales valleys are affecting the ambitions of young people living within its towns, says a Labour MP.