What's wrong with his expression?! Corgi's face goes all weird after being petted by his eldest son

I found myself out there in the dark of the night Everything you say Dusty, dusty, dusty Love is dust, dust, dusty Everything you say I found myself out there when the night was lost Lost, lost, me, me, me, me, me, me, me, me, me, me, me, me I found myself out there when the dark of the night When I was lost, lost, lost, needed, needed to revive Oh They are going to run away! It's a big hole! Get ready! Get set, go! It's a success! Champi! Champi, you can do it! Champi, come on! Champi, you can do it! Come here! You can do it! Champi, you can do it! You can do it! Lucas! This is different. Melon soda and coffee. There's a little bit of cherry in it. Yeah, there's cherry in it. Melon soda and? Coffee float. Oh, no, it's not. It's a cola float. It doesn't feel like you're running. Ready, go! Oh! Show me. Oh, you did it. That's amazing.