Ways to support someone who’s just lost their pet?

My partners 16 year old cat was euthanised yesterday at the vets. He had stomach cancer that was only noticed 2 months ago, so too late to treat. I’ve tried my best to comfort my partner and be there for him the last 24 hours, but I feel like I’m not doing enough to help. Is there anything (within reason) that I should be doing, or is just being there for him and being a shoulder to cry on enough?
Ways to support someone who’s just lost their pet?
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