I'm trying to get some insight on what may be going on here.  My dog is at Open B level, he's a year old so he's still pretty young but doing well.  When we go to a trial or a practice, he does super on the first run of the day however on the subsequent runs he is not interested in hunting for rats.  Instead he spends time looking for dropped treats or eating straw.

I'm not sure if he's stressed, just has ADD, doesn't understand he needs to keep hunting, that the game continues or what?
I can get him to climb and tunnel however he seems to be done hunting rats.

I've thought of only doing one run each time we go out.  I don't like this as many trials and practices are over 50 miles away and I hate to travel that far for a couple of minutes in the ring.  Plus it is putting all my eggs in one basket so to speak.

Suggestions or ideas of how to get through this funk? 
Or does this seem like a maturity issue?  Am I expecting too much for his age?
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Jennifer Giacchi BHAJ-242B
Do you have video?

Off the top of my head I can think of two things...

are you rewarding him well enough during AND after the first run? Maybe he is getting demotivated?

how much time is between his two runs? (Maybe not enough, maybe too much?)
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Pam Opanowitz BHAJ-100A
My recommendation would be to raise the reward at the rat...stabilize it and encourage him working it a few extra seconds with lots of praise...and extra treats when he comes out of the ring regardless of whether you Q or not.  With his age I'd also recommend 1 run only with extra praise for awhile.   In a few months try 2 runs and see if he changes as he matures.   

For practices, do something fun between runs if you can.   Tug, ball..not sure what there is room for where you practice.   But just something fun that doesn't involve hunting.   Hunting is a lot of brain work and its too much for young dogs sometimes to do it twice without something fun in between. 
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I have a lab that is exactly the same way.  She is 6.  She is a one run and done dog.  It is frustrating, she did the same thing in agility.   I have come to realize it is just how she is and you really can't change it.   Probably not the answer you wanted but it took me a long time to realize it.  My other dog will do run after run after run.  Just personalities.  I know if I try to push her she shuts down even more.   
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Marie Doremus BHAJ-241B
Video your runs in a trial and video your practice runs, are you acting and doing the same in both?  In a trial, Are you running in and taking the rat away without the dog getting any satisfaction.  Look at it from your dog’s point of view, every time he finds a rat, he’s pulled back and the rat is removed, it would not be unusual for him to think he’s not supposed to touch the tube.  Like Pam said, be sure you stabilize the tube and let him enjoy his find with lots of praise, before you take the tube from him.
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Do you run Crazy8s? Sometimes having all those rats on course is very motivational.
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Wow thanks for all the responses.  I will have someone video his runs at the next trial. 
We already use the rat as the reward and he gets ample time with it when he finds it...we play with it and make it fun for him.  We learned I cannot hand it to the wrangler as it was demotivating to him.  I have to let them pick it up.  
We have done crazy 8's once  and he did ok, i think 50 points.  And that day we did two open trials (got one q) and the c8. 
I may try taking him for a walk and then crating him in the car between runs, he might be overstimulated.  
Someone also suggested we skip a week of practice and see if that helps since we usually go 1x a week either practice or trial.  Practice is only 2 runs but we take our time and work on problems.  
Thanks everyone.  I appreciate the insight!
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Brenda Hinkemeyer BHAJ-203A
Practice can ruin some dogs. I do not practice with my dogs. FYI
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Also consider your dog's time between runs. Developing a routine so they know when is time to rest (and they actually rest) and when it's time to get pumped up or focused (which ever dog needs). For example, being "on" all day could lead to burnout for the day, and not learning how to get back in drive mode could lead to being easily distracted. Each dog's needs vary. 
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Had a similar problem with a Masters dog who had to wait for 4 to 5 hours while lower levels were run concurrently (and we had a dog in the lower levels). What helped get her back in the mood was (1) throwing a little party when she found each rat and (2) taking long walks. 
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