Why is my dog so tired?

I have a 7 pound malshi who is 8 months old and FULL of energy! But lately he’s acting much more tired... we got him fixed about 3 months ago and it never affected him so could that be calming him down? He’s still drinking and eating and plays at the dog park. He also still comes when called and acts completely... show more I have a 7 pound malshi who is 8 months old and FULL of energy! But lately he’s acting much more tired... we got him fixed about 3 months ago and it never affected him so could that be calming him down? He’s still drinking and eating and plays at the dog park. He also still comes when called and acts completely normal... he just lays down more when he’s out of his crate and seems like he’s super tired... we’ve checked him for fleas and ticks and he’s still going to the bathroom like normal. I’m just not sure if I should be worried or wait it out? He’s been acting this was for about 3 days now.
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