11 months old eurasier puppy stressed and not eating

Hey all,

My almost 11 months old eurasier is small, really really small, we're talking 15 pounds less than his brothers and sisters. He also didn't gain a pound in the last 4 months, isn't eating much despite us trying a lot of different things and his poops are horrendous despite probiotics.

On the other hand, ALL he wants to do is go outside, all the time, always. When he's outside, he turns crazy, runs and pisses everywhere and is acting cazy hours later, can't settle down or sleep. Even when he sleeps, if we move in the house he'll get up and be ready for action.

So we really don't know… does he not eat because he's just not hungry? He barely gets in half of his daily calorie needs per day, as calculated by the vet. Does he not eat because he's overstimulated for no reason? Does he just hate his food?

We're having a lot of doubts, oscillating between going back to the vet for a more comprehensive testing or talking to a dog behaviorist =/

Does anyone here have a similar experience? If so, I'd love to hear about it!

Thank you all and have a good day!