A very few will refuse to accept a new partner until they have completed grieving, but most will break out of their grief immediately if they find a new mate, so I strongly recommend doing so as quickly as possible. Of course, rabbits may become seriously ill and die at home.
Although rabbits can be happy singles if they have enough companionship from humans, a rabbit that has been used to living in a pair is unlikely to ever be completely happy on its own again. A bereaved rabbit will sometimes accept a new partner very quickly, even the day after its old partner has died in some cases.
In the wild, rabbits live in big groups and they enjoy being with friends who will play with them, groom them, understand them and look out for them. So if these sociable animals are kept on their own, they may become bored, depressed, and very lonely.
Rabbits are social animals, so a single rabbit is likely to feel lonely and depressed. Rabbits can live alone, but you'll need to provide your pet with the attention (company, petting, grooming, exercise, playing, and enrichment) that a bonded rabbit partner would provide.
Rabbits are a social species and have evolved to live in groups. In the wild, rabbits do not live alone. Rabbits kept as companions are not biologically different from their wild counterparts and so their innate need to be kept in the company of other rabbits is just as strong.
Barring the odd rogue rabbit that likes the lonely life, rabbits generally benefit from the company of other rabbits. They will often be far happier and content with a mate. Rabbits are not that unlike humans, they also get bored, even depressed, and when they do, they often act it out with destructive behaviour.
Even if you have a pair of rabbits, 24 hours is the maximum time they should be alone. Like all pets, rabbits rely heavily on their owners. Domesticated rabbits lack the survival skills of wild rabbits. Your rabbit has basic needs surrounding food, exercise, and stimulation.
Rabbits can live happily in male/female, female/female, male/male pairings and larger mixed groups. However, the most natural and therefore easiest pairing is male/female. In the wild, rabbits tend to live in male/female pairs and will sometimes remain partnered for life.
RHDV2 is a highly contagious virus that can spread quickly among rabbit populations. But poses no human health risk. RHD causes sudden death in rabbits and spreads through direct contact between live rabbits or exposure to contaminated materials (carcasses, pelts, food, water, and forage, etc.)
Animals do not necessarily cope with grief in the same way that we do, but their grief is nonetheless stressful. If your surviving rabbit misbehaves during the weeks following a death in the family, you may tend to scold and reprimand without realizing that he is experiencing difficulty of his own.
When one cat in a bonded pair dies, monitor your other cat closely. He must eat, drink and use his litter box as usual. If your grieving cat stops eating for more than 24 hours, seek help from his veterinarian. Watch his sleeping patterns as well.
A lonely rabbit may become hyperactive and angry. They may display destructive behaviour such as gnawing at the carpets and other furniture. Lonely rabbits may pull at their fur and overeat.
Rabbits can only be left alone for a maximum of 24 hours. If a rabbit doesn't eat for 24 hours it can die. 8-12 hours is more optimal, especially if they have a companion, space to exercise, and food to eat. Bunnies kept alone, or who crave more attention and care, will do best when left for 3-6 hours at most.
You may worry that your rabbit will be lonely. If you spend a lot of time with your rabbit, they will undoubtedly miss you when you're away, the same way you miss them. The two of you have developed a bond and friendship that your pet rabbit also understands.
Rabbits are social and intelligent creatures. They'll know that you love them; you just have to learn how to say “I love you!” in a way they'll understand. You can show your rabbit you love them by giving them gifts such as toys and yummy treats.
The signs of an unhappy rabbit
Pulling at their fur and over-grooming - or not grooming at all. A change in feeding or toilet habits. Drinking a lot more. Repeated circling or pacing up and down.
It's never too late to get a friend for your existing rabbit. There are many cases where older bunnies have spent their twilight years happily with a new companion.
Some rabbits are very confident right from the start and will be happily exploring on the first day, but most rabbits will be more-or-less settled into their new home within 1 to 2 weeks. Usually, rabbits who are familiar with you and moving to a new home will adjust more quickly than a new rabbit who is brought home.
If your rabbits are mounting each other a lot, instigating fights, stop them, place them side by side. Pet them together and talk to them quietly. Do not let much chasing ensue. If they are persistently aggressive, separate them to prevent injuries.
The time to obtain a new pet is when you have worked through your grief sufficiently to be confident that you can look forward to new relationships, rather than backward at your loss. For some people, that might be a matter of days or weeks; for others, it might be months or years.