The hard part of pet loss is rarely the grief itself. It is the silence around it. There is no bereavement leave for a dog, no casseroles arrive, and people who would have sat with them for a week if a person had died will ask, four days in, whether they are thinking about getting another one. That gap is what makes this grief so lonely, and it is the thing you can actually fix.
Say the animal’s name, and treat it as a death. Not “sorry about your cat” — “I’m so sorry about Marmalade.” Fifteen years of a creature woven into every ordinary morning has just ended. Meet it at that size.
Never ask about getting another one. It is the single most common thing said and it functions as a replacement offer, which tells the grieving person that the one who died was a role rather than a someone.
Never say “it was just a…” Not as a joke, not as a softener. For a lot of people, that animal was the being they spoke to most in a day.
If they chose euthanasia, be careful with reassurance. The instinct is “you did the right thing,” and it seems kind. But it answers a question they are still asking, and if their private conviction is that they waited too long — or went too soon — your certainty just leaves them alone with it. Better: “That is an unbearable decision to have to make, and you made it because you loved him. I’m so sorry you had to.”
Do the specific thing. The house is full of triggers — the bowl, the lead by the door, the spot on the bed. Offering to put the bowls away, or not to, is a real kindness. So is remembering, in a month, that the mornings are the hard part.
If you want to go further, they may want to talk about the animal and have nowhere to do it. Asking “what was he like as a puppy?” gives someone permission that the rest of their week will not.
There is more here on what the grief itself is like, written for the person going through it rather than the person beside them: the questions pet loss leaves you with.