First time failed when the Cow got hit 3 times and could not use Udder Destruction. Should just restart if this happens. If it DOES NOT happen and you only get hit 2 times so you CAN use Udder destruction, this is a super winner strategy. Worked perfectly, Foulclaw had just over 200hp when the Bandicoon came in so the bite finished him off lickity split !! Thanks :)
My fast pets didn't do enough damage with this strat so I replaced second pet with Fawn with 305 speed and used Headbutt. Awesome strat, as between roaches, beetles and hoppers with Hiss/Screech and Swarm people should have something that works
Definitely add 3x Hiss and Swarm users as a viable alternative strategy. I managed it with the random breeds I have, killed Foulclaw with the 2nd critter.
Resilient Roach, Savory Beetle and Scarab Hatchling were the 3 I had.
I used fawn (2/1/2], Rapana whelk (1/1/1), Shimmershell Snail (1/1/1]
Start with stampede, and follow up with headbutt. Your Fawn dies.
Follow up with Rapana whelk. Use Acidic goo, dive, ooze touch until your snail dies.
Shimmershell snail. Use Acidic goo, dive. Foulclaw should be dead.
Note: If your Fawn dies before it can use headbutt, reset the fight
Worked will a small difference. Little Fawn was the only fawn I had and wasn't working, so I used Darkmoon Hatchling and 2 Silkbead snails with the same moveset as your snails. Was able to Screech > Flock > Screech > Trample after a few bad tries with RNG and crits by boss. Hatchling died, and immediately used a dive to beat the crouch timer. During crouch I spammed acid touch until my first snail died. This allowed my second snail to immediately dive with the previous acid debuff up, and after the dive the final acid goo tick killed the boss. This was with no crits.
There was some trouble with the last snail, so I swapped in Zoom!. With the first snail I managed to get in another Acidic Goo rather than the Ooze touch, then used Zoom's Charge twice. I tried it a few more times and IF I could get a Headbutt in with the Fawn, Zoom did fine.