Table 1.

Clinical T stage of canine tumors of the oral cavity^a

T0	No evidence of tumor
T1	Tumor < 2 cm maximum diameter T1a without bone invasion	T1b with bone invasion
T2	Tumor 2 to 4 cm maximum diameter T2a without bone invasion	T2b with bone invasion
T3	Tumor > 4 cm maximum diameter T3a without bone invasion	T3b with bone invasion

^aT_is category not included here