IDK if it works this way with dogs, but with cats, if one of your pets dies, you should show the body to the living relatives, let them sniff it and be aware of what's going on. They will deal with it better if they know what happened than if Other Buddy just disappeared one day and they don't know if buddy is coming back.

My cats absolutely have felt sad when another cat died.

Animals can't express themselves vocally as we do, but I'm of the belief that they feel emotions and pain the same way we do. I mean why wouldn't they..

Definitely, our 2nd cat really changed when the first passed on. Much more quiet and really affectionate to us specifically.

When I lost my Chihuahua, my other dog and my roommates cats definitely acted a little off and we attributed it to them grieving. We also thought it could be them responding to our emotional state but we were never certain tbh

They definitely do. One of my cats was depressed for months after another of my cats passed away.

i've definitely observed this. my first two cats bonded super hard and after the first died the second was just miserable, for what felt like months.

my cat let out a loud and long meow of anger and disappointment each time i brought my dogs home at the beginning and he seemed to only tolerate their presence; he didn't seem to notice when they died. he's an asshole but i love him.

Studies also find that cats will eat you face off if you die alone with them

Awww :( :(

Garfield: “Now who will I push off the kitchen table?”