Territorial marking is greatly reduced when both rabbits are fixed. False pregnancies stressful for all parties are less likely. And the possibility of a real pregnancy and the resulting increase in the number of rabbits killed in shelters is avoided. When we first began matching rabbits, conventional wisdom held that males, even if neutered, cannot live together. We have cared for a great many male pairs, as well as larger groups with multiple males, and found that males can form close friendships.
Age plays a minor role in determining compatibility.
Adults generally prefer other adults or teenagers, and baby bunnies do best with another youngster. Temperament refers to your rabbit's sense of herself in relation to others, and specifically to other rabbits. She may be bossy and confident, bossy and insecure, timid, mellow, asocial, anti-social, terrified, or some combination of these traits. A common experience for fosterers is a stunned, embarrassed human who has brought his rabbit to meet potential companions. Many of these will allow you to bring your rabbit with you, so she can meet several prospective pals on neutral territory.