Critter Brawler

I just found out [npc=110741] to be very useful in this.

Critter achiev was one of the hardest for me. The composition that helped me the most was:
[npc=110741] 1/2/2, was P/P but I think other breeds are fine too
[npc=16548] 2/2/2
[npc=33975] 2/2/2 a bit of luck but Stench was a life saver a lot of times!

Hope that may help you as well.

Here's my team that got me 5 wins in a row at the end. (After struggling with the first 5 wins)

[npc=73730] (2/2/1)
[npc=110741] (1/2/2)
[npc=85710] (2/1/2)

Start with Gu'Chi and Chew then Swarm. It will likely die, but it will weaken the first pet enough that your fawn or bird can come in and cleanup. The Fawn being P/P helps immensely. Headbutt on Cooldown, otherwise Hoof unless there's a chance to use Nature's Ward. Stun on Cooldown with Lovebird, otherwise Alpha Strike/Predatory Strike when possible.

I was having a pretty hard time with this one until I started using 3 frostfur rats. They have a move called Refuge that's super powerful. I did them all (1-2-2)