Massachusetts shelters are aiming to find homes for 100 dogs this weekend.

The adoptathon waives fees for adult dogs, which include all dogs over the age of 1.

Shelters across the state are grappling with high dog populations amid a slowdown in adoptions.

“We had great momentum over the summer, but as soon as animals go to new homes, those spaces are filled by others who need to come into our care,” Jamie Garabedian, project manager in the MSPCA-Angell’s Animal Protection Division, said in a statement.

The shelters involved in the adoptathon include, MSPCA locations in Boston, Methuen, Salem and Centerville and the Massachusetts Animal Shelter Support (MASS) coalition members Berkshire Humane Society, Boston Animal Care and Control, Worcester Animal Rescue League, and Thomas J. O’C

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