I'm still working on trying to figure out what is causing it. The three things I've narrowed it down to are respeccing, adding or removing the talent Blink Strikes, or casting Stampede. I'm leaning towards the latter.
I play SV and didn't touch blinkstrikes and noticed that the Pet was on full focus for some when I entered a Heroic Scenario. Then I checked whether it was on aucocast in the spell book, and it was, and also it started to use "Claw" again and lose Focus after those seconds.
Maybe the new Aspect of the Hawk has somethign to do with this because I also remember using that.
I've been having this since the start of MoP and have reported it as a bug multiple times. Sometimes my pets just decide to never autocast anything in any spec and I just need to abandon them and tame a new one. Currently my Cat doesn't autocast anything it should,
Tested LFR with BM and Quilen and the "Bite" attack seems to behave inconsistently. Like sometimes the Pet uses it on CD and on other times it uses it every couple Seconds and then later maybe 20 Seconds pass between Attacks.
On other times it stops using the attack completely so I help out by casting manually and then either nothing happens or it starts to use the Attack every couple of seconds again. (When I say "a couple seconds, I mean a couple seconds after the Pet receives Focus for that attack of course)
@Bassch happens with and without the Basic attack on the action bar.
Had A Murder of Crows talented before the Patch and still do.
Hmm, I'm glad I wasn't the only one who noticed this in tonight's raid.
My pet's basic attack usages just looked... somewhat inconsistent at times. I actually decided to put it on the action bar to observe it more carefully, and strangely enough, it was being delayed on *some* fights. I don't think it happened all the time, but something didn't feel right. This behavior was definitely not happening prior to 5.3.
I was testing my DPS with different talents with my purple arcane serpent on the second training dummy (alliance shrine) when I saw that my pet doesn't auto cast Bite at all when specced for aMoC or Lynx Rush. Bite worked fine when specced for the new Blink Strikes. I noticed the same behaviour when I tried my red arcane serpent. Irritated, I tamed another serpent with a normal model, but that worked fine.
My next idea: "maybe only the dummies are bugged?" I tried my purple arcane serpent on a quest mob nearby, autocast did work fine.
Back to the dummy: no autocast.
So I thought: "let's try another dummy". autocast worked fine on the left dummy. Very strange.
"Ok, I'll try the second dummy once more". This was even stranger: My pet auto attacked the second dummy just fine, but did use auto cast Bite on the left dummy (which I had targeted before, but it was no longer my target or focus target... my pet shouldn't have attacked the left dummy at all).
edit: just downloaded a small (~20MB) patch. My violet arcane serpent still doesn't auto cast bite when specced into aMoC or LR on the second dummy.
If you pve then I guess I can understand the auto casting of it but if your pvp then you should really make a macro so that you control the the bites, claw ect. What this macro does is allows you to use blink strikes just like the old blink strike, plus, when you get cobra strikes you get guaranteed crits with it. I've been toying with it and got some astounding results. Those results being my pet having a 3 second cd attack that is off my global cost me no focus and can hit from 30-60 crits, and it always crits with cobra strikes.
Sure its more to manage, I would be lying if I would say im completely comfortable with it but, dam its pretty nice, nice enough where I don't think its intended to be used this way.