I thought I give you guys some hints because its hard. But do your best first.
Col 1 Row 4-7; 12-15; 18-22.
Col 2 Row 1-3; 8; 11; 16,17; 23-25
Col 3 Row 2; 9; 11; 16;
Col 4 Row 3; 5; 10; 13; 16;
Col 5 Row 2; 8; 10; 14; 17; 24,25

The Cat's head is in top left and its symmetrical. hope this helps. If not I will do the next five columns.

I hope these next ten columns will help.

Col 6 Row 2; 6-8; 10; 14; 18; 22; 24.
Col 7 Row 2; 8; 10; 15; 19; 21; 24.
Col 8 Row 3; 5; 10; 16; 20; 24
Col 9 Row 2; 9; 11; 17; 20; 24.
Col 10 Row 1-3; 8; 10-13; 17; 20; 25.
Col 11 Row 4-7; 9,10; 14; 17-19.
Col 12 Row 1-3; 8,9; 15,16; 21-23.
Col 13 Row 1-6; 8; 11,12; 15; 17-20; 23,24.
Col 14 Row 1-6; 8; 11,12; 14-17; 19; 23,24.
Col 15 Row 1-6; 8; 13; 18; 20,21; 24,25.