There combat level is usually 122 or 127
link to wiki hellhound:
http://runescape.wikia.com/wiki/Hellhound
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Here's a few places where you'll find Hellhounds: - God Wars Dungeon ( Level 127 - Max Hit 14) P.S wear Zamorak cape ( mage arena ) to avoid being teamed. - Taverly Dungeon ( Level 122 - Max Hit 13 ) - South Of Taverly - South Of Axe Hut - Members Wilderness - Eastern Ardougne Dungeon - Wilderness Volcano (the only site in free-play)
to change your stats on runescape all you have to do is level up.
The RuneScape monster TzTok-Jad's stats are: Combat Level: 702 Hitpoints: 250 Max Hit: 97
Black Dragons are level 227.
Complete level one