A wise old dog man once posted " if you have a good dog that has been performing consistently for that long, you better consider his health if he suddenly starts performing poorly". More than likely it's a health issue if he has been performing well for that long.
Heart worms and brucilosis come to mind on this one. I could be off on this but he sounds like he is worth getting checked out by a vet.
Keep us posted on it.
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i would take him to the vet and get a heartworm test done.....i've seen a lot of dogs come in to the clinic i worked at and you couldnt really tell anything was wrong, but the owners said the just were'nt acting right. sure enough they had heartworms....all it take is for you to be a little late on their ivermection once and if they get bit by a misquito thats it...if you didnt raise the dog from a puppy he could have had them before you got him and just never showed any signs...they dont really show signs till they are 4-5 + years old. Hope this helps ...keep us posted...thanks, Mrs. Kbar
