A report submitted for the Queensland Government has shown an increase in kangaroo numbers inside state-funded cluster fences, which animal welfare groups warn could lead to further inhumane culling.

The Queensland Government has spent $31.74 million on more than 9,000 kilometres of fencing in a bid to protect sheep from wild dog attacks.

However, kangaroo numbers have gradually increased as wild dogs have been culled, with the RSPCA expressing concerns over the culling methods some farmers are utilizing.