Can rabbits forget each other when not seen for a few days?

Today my 1.5 year old Australian Shepherd has been very lethargic, sleeping soundly the whole morning and also the whole evening. However, when I took him to the park, he tore around like a crazed puppy for more than 30 minutes. When we returned he was slow to eat his dinner and hasn't had much to drink either. He ate a piece of food he found by the road this morning as well as some feces in the park, but has no vomiting or diarrhea. Just lethargic (exception of the park.) Should I be worried?

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我的狗大约 5 年前圣诞节前后被安乐死。他在两个月内减掉了大约25磅。他的粪便呈黑色，带血。他每周接受静脉注射治疗，并接受一个月的泼尼松治疗，但病情从未好转。我内心深处知道他没有好转，但我的兽医说我们可以继续接受检查和每周更多的静脉注射。我做出了放下他的选择。他是一具骷髅。当他死时，一股粉红色的液体从他的鼻子里流出来。兽医说：“你做对了。”她只是表现得很好吗？

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