However, these estimations were obtained from comparisons of the carnassial teeth. There is variation among the carnassial pair depending on the family. Fluctuations in the size of "C. lupus" carnassial teeth correlate with the spread of megafauna. Carnassial teeth infections are common in domestic dogs. A jaguar can bite with a force of at canine teeth and at carnassial notch. Their flesh-shearing carnassial teeth are relatively undeveloped. The carnassial teeth in feliforms, however is more sectional. In bears and raccoons the carnassial pair is secondarily reduced. On the other hand, carnivorous marsupials have carnassial teeth. The dentition of hypocarnivores consists of dull, triangular carnassial teeth meant for grinding food. Foxes have pronounced carnassial pairs, which is characteristic of a carnivore. Likewise, neither members of Oxyclaenidae nor Arctocyonidae had carnassial teeth. The location these carnassial pairs is determined primarily by the masseter muscle. It also has four carnassial teeth that cut the meat into small pieces. The lower carnassial length can be used to estimate carnivore body size.