I've recently started working out again (2 months). I started doing a light full body work out 3 times a week. After getting into a routine and figuring how to fit it in (and, honestly, just seeing if it was something I wanted to stick with), I decided I wanted to chang my workout to add some mass. I met with the trainer at golds and he set me up with a work out plan for 3 days a week. Chest/triceps, back/biceps, and legs/shoulders. I'm working abs every workout. Question I have is, he has me doing lat pull downs, which hit the target muscle, but my arms are giving out before my lats do. I can tell my lats still have a lot of work left in them, but I just can't do another rep. Am I doing it wrong? Thanks in advance

I like to do my larg mucles first, so for back/bis I do all my back first and then what ever isolation I have on the bis. otherwise no that's a common thing and your doing it right from what I can see. What you can do is another exercise like cable pulldowns.

If it's common, I guess I'm doing what i can. I do machine row and and 1 arm dumbell rows too. I wake up the next day and my biceps are feeling it, but my lats feel fine. just wish there was some way I could make them hurt like every thing else. I'm afraid that if i'm not feeling it, they just aren't going to grow like the rest =(

Just so you know, my back/bicep day looks like this:

Pulldowns 4X8
Barbell curl 4X8
Machine row 3X8
Alt dumbell curl 3X8
Dumbell Row 3X8
Preacher Curl 3X8

Then I do abs.

that is a good general workout with a solid foundation/order, but any good bodybuilder knows they must customize it to there bodys needs, for you I would start out by cutting out (Alt dumbell curl 3X8) and replace it with wide grip cable pulldowns set 4-6 reps 6-8 and I think this should fix this problem or at least get you started. better order with this change.
wide grip pulldowns 4-6/6-8
Barbell curl 4X8
Machine row 3X8
(rest for 2-3min)
Pulldowns 4X8
Dumbell Row 3X8
Preacher Curl 3X8

resting is for this long is not recomended but in this case it will do more good than harm.

Great, thanks Phaledax