Last night's custom critter

Dragonspider
(Medium Half-(red) Dragon Monstrous Hunting Spider)
Medium Dragon
Hit Dice: 2d10+4 (15 hp)
Initiative: +3
Speed: 40 ft. (8 squares), climb 30 ft.
Armor Class: 18 (+3 Dex, +5 natural), touch 13, flat-footed 15
Base Attack/Grapple: +1/+1
Attack: Claw +8 melee (1d4+4)
Full Attack: 2 Claws +8 melee (1d4+4 each), Bite +3 melee (1d6+4 plus poison)
Space/Reach: 5 ft./5 ft.
Special Attacks: Poison, web, breath weapon
Special Qualities: Darkvision 60 ft., low-light vision, tremorsense 60 ft., vermin traits, immune to sleep and paralysis, immune to fire
Saves: Fort +5, Ref +3, Will +0
Abilities: Str 19, Dex 17, Con 14, Int 2, Wis 10, Cha 4
Skills: Climb +15, Hide +7, Jump +14, Spot +8
Feats: Weapon FinesseB
Environment: Temperate forests or warm mountains
Organization: Solitary or colony (2–5)
Challenge Rating: 3
Treasure: 1/10 coins; 50% goods; 50% items
Alignment: Always chaotic evil
Advancement: 3 HD (Medium)
Level Adjustment: —

Dragonspiders are the result of an insane attempt to crossbreed giant hunting spiders and red dragons.
Poison (Ex): A dragonspider has a poisonous bite. Fortitude DC 13 or take 1d4 Str damange both initial and secondary.
Web (Ex): Dragon spiders often wait in their webs or in trees, then lower themselves silently on silk strands and leap onto prey passing beneath. A single strand is strong enough to support the spider and one creature of the same size. The web is break DC 17 and has 6 hit points.
Breath Weapon (Ex): 30-foot cone of fire. 6d8 points of damage. Reflex save vs DC 13 for half. Useable once a day.
Tremorsense (Ex): A dragonspider can detect and pinpoint any creature or object within 60 feet in contact with the ground.
Skills: Dragonspiders have a +4 racial bonus on Hide, a +8 racial bonus on Climb checks and Spot checks, and a +10 racial bonus on Jump checks. A dragonspider can always choose to take 10 on Climb checks, even if rushed or threatened. Dragonspiders use either their Strength
or Dexterity modifier for Climb checks, whichever is higher.