Weirdly lethargic?

[Joya]

Jet is normally really active and happy, loves going for walks and playing in the garden but for the last few weeks, on and off he has been getting more and more lethargic and we can't figure out why. He doesn't get excited when he sees his lead, and would rather be asleep in his (or my

) bed than play in the garden.
He's been to the vets a few times recently, he had a blood test to check his pancreas was working properly because we were worried he wasn't putting weight on, but is ok now.
He went in again because of him being lethargic and we noticed he was limping slightly, so they said he may have pulled a muscle and put him on painkillers, he came off of them a few days ago, and although he isn't limping anymore he's still lethargic.

Nothing has changed, same diet and amount of excercise and attention as usual. He has a shiney coat and outwardly looks healthy. Do you think we should take him back to the vets or are we just worrying for no reason and he will perk up soon?
Sorry for the questions lol.

 

[random_rider]

Well maggie was lethargic when she was ill but the antibitics made it better! But with my old dog a couple of days after her antibiotiics she was still feeling lathargic! so id give it a couple more days or even one and then just check him up! if hes not in pain cant be too serious! Take it as a blessing! Its nice when there more relaxed but i know what you mean, its scary because its so different from them!