My bed feels big and empty and I hate it

So sorry... have you changed the sheets yet ?
Put some freshly washed sheets, I'd personally smudge or burn incense or at least light few candles for his soul. That's me and maybe you're not using these ways to cope but I'm finding that small rituals help a little..
Do you have a friend you could invite over? A girl friend preferably to not mess with your vulnerable moments..
I'm sorry. For me animals are no different to humans.