Think my dog is depressed, looking for advice please.

hello all,

I have a 3 year old red cattle dog that I think is depressed. He just looks really sad and stares at me.

I take him for enriching walks to different places daily, my partner and I are both home full time now so, he shouldn't feel lonely.

I am currently pregnant (due any day now) and have a two year old. I made sure that I continued to walk and do scent work with my dog even when my baby was weeks old.

the only big change I can think of is that he isnt allowed inside as much, so I make sure we have our meals outside as a family with him.

any advice, bumming me out and feel like I am a shitty mum.