
Yes, dogs do grieve! We brought Louis home after he'd died at the vet. We needed him at home so the family could say goodbye. We allowed our baby Pierre to sniff him and lick and nudge him so he would know that he was gone. He wouldn't eat and lost weight, he wouldn't play - it was so sad. He was definitely grieving and that was for a playmate he'd only known for 4 weeks! It took about 5 weeks until he was back to being a daft pup again :)
When Pierre died last year, we'd had Eve for 1 week only - too short a time for her to really know him and grieve, but we filled the following weeks doing lots of things with her.......and bought another pup!! We so wished we had done the same for Pierre, he might not have taken it so hard ( and would probably have helped us too! )
I think the only way to make grieving easier, for us and for our dogs who grieve, is to fill the time with lots of different things, anything to take the mind off the loss. If you sit and do nothing, it's the only thing you think about and prolongs the pain, as I found.
As other posters have said, lots of nice walks, different places, new toys and different games etc will help you all. You may have to sort of 'jolly' them along for a while, yourself too, but one day soon you'll realise it's not taking as much effort to actually have some fun :)
(Hugs) to you and your girlies xxx