狗狗全身无力什么愿意？
你确定是“无力”不是“无力气”？ “力气”用英文表达就是strength，所以如果狗没有力气，那就是lose their strength. 如果是这个意思的话，那通常和生病有关了——生病了嘛，当然就会loss of energy(精力)！
我举几个例子给你听吧： My dog is really down with the flu， and he just lies on his bed all day long without any power whatsoever！ 我家的狗得了重感冒，整天就窝在窝里没一点精神。 He's been feeling under the weather for three days now， and it looks like he has no more fight in him！ 他已经感觉不舒服3天了，看来他一点都没有康复的迹象啊！ I can see that my little puppy got a cold， because she just won't move at all right now！ It might be time to take her to the vet！ 我看到我的小狗有点感冒迹象，因为现在他完全一动不动了...可能该带她去看兽医啦！ The older dogs are getting very weak after they had surgery last week， so we have to care them extra carefully！ 老狗上周刚做完手术，现在身体非常虚弱，所以我们得好好照顾它们才行！ Your cat seems pretty tired today. She isn't even interested in playing like usual. Maybe you should give her a few minutes of rest！ 你家的猫今天看起来好累哦…它连玩都懒得玩了…可能是累了需要休息一下呢~