Jack99 said:
Comparing the riding dog to the fleshraker:
riding dog (for a 4th level druid) 4d8+8 hp, bite +6 1d6+4 damage, ac 19
fleshraker (and lets forget about natural bond, since it is a very debated feat) 4d8+8 hp, claws(2) +6 1d6+3+poison, bite +1 1d6+1, tail 1d6+1+poison, ac 20
So, same HPs, more or less same AC (fleshraker wins by a very small margin). However, max damage (no crits) for the mutt is 10, while it is 32 + 18 dex damage for the fleshraker. Even though 2 of the attacks has little chance to hit, the claw attacks are just as good as the dog's, there are two of them, with dex poison damage on top.
That is, in my mind, quite a bit of a difference. Not to mention that the fleshraker can benefit much more from the feats that it will gain as it increases in HD (multi-attack and focus ability (poison) both come to mind). The DEX damage is lethal against many targets.
Of course, that's not a correct comparison.
Firstly, a riding dog has those stats on a
3rd level druid, which is a nice bonus!
Then, since you've added a 4th HD, you may add +1 to an ability score, which ,since constitution is odd (and str/dex aren't any longer) you'd most reasonably add to Con. Also, you can add a feat, and for fair comparison, adding improved natural armor is reasonable so both have exactly the same AC, even though potentially more useful feats do exist.
So, a riding dog would have slightly more hp (4 more), the same AC, the same attack bonus, but far fewer attacks, no pounce and no poison.
is a fleshraker more powerful? Yes. But it's also one level higher. You could also get a dire bat, for the same AC, again slightly more hp (30), but large and flying (i.e. a handy mount) and with the potentially useful blindsense.
Is the fleshraker too good an upgrade for a mere one level bump? Perhaps. But it's not going to be a problem in a party which is strongly min-maxed, and certainly not in a party like the actual poster's, which included a bunch of dubious Exalted stuff and whatnot.
Edited to add: Oh yeah, and don't forget that riding dogs (can) come trained for war, which means they can wear armor without extra penalties, which is a BIG boost!
In other words... it might be a problem in some situations, but it shouldn't be a big one in this particular case. I think the DM's ruling that the poison applies max once per round is a good compromise.
Like many other splat book abilities, it's not broken per se, merely powerful, and it's most problematic when only part of the party is using that kind of stuff. As long as everyone is benefiting from splat-book power-creep, then it's a question of taste; do you like splat books or not?