Dog Grieving Due to Loss Of Sister?I actually had two dogs, a Golden Retriever (female) and German Shepherd (male). They actually really get along well, play together, share foods, sleep together and explored places together with our neighbor's dog. My female dog suddenly got really ill and died. After that, my male dog changed. He used to eat a lot, being playful and energetic which is now completely opposite. He became timid, he sleeps a lot, eat less and doesn't want to play with other dog like he used to do.