Pressure is mounting on the NSW government to declare bipartisan support for the creation of an Office of Animal Welfare after the Greens announced it would take the policy to the election on Sunday.

Animal rights groups and a Coalition MP have declared their support for the government to investigate policy changes.

Animal rights groups and a Coalition MP have declared their support for the government to investigate policy changes.

The calls come after a string of shocking Animal cruelty cases in NSW were revealed by animal welfare groups and Fairfax Media.

The state's chief regulator of animal welfare, RSPCA NSW, has declined to comment.