In the early 90's, I used boilies made of mostly ground go-cat.They air dried rock hard, and were also hard to hair rig. I caught a few
carp and tench on them, but shelf lifes got the better of me. Now I still sometimes use powdered cat biscuits, but at no more than 25%
of a base mix. I only fish short sessions, so a softer bait suits me.