We found a stray dog which is really not enough loved in the past and seems to be quite low in his weight. When we start feed him his legs began to tremble and he finally sat down like he didn’t have the energy to stand. We cant take him to the vet for another eight days. What can we do to help a dog gain some weight until then? If it can help with answers, he is a lab pit mix, about 40 lbs.