This loving mastiff didn’t mind adding one more to her litter of pups, even though it didn’t have a tail to wag and was suspiciously wearing a diaper.

The little ape had been rejected by its chimpanzee mother at a Russian zoo. So a worker took it home, not realizing her 100-pound dog, who had just given birth to four puppies, would take over maternal duties and raise the little chimp as her own.