My dogs don't have a body and they only have two legs.
Here's a crash report:

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Manually triggered debug crash

A full error report has been saved to C:\Users\Keaton\AppData\Roaming\.minecraft\crash-reports\crash-2013-04-15_11.07.08-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash

— BEGIN ERROR REPORT e4210d79 --------
Full report at:
C:\Users\Keaton\AppData\Roaming\.minecraft\crash-reports\crash-2013-04-15_11.07.08-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 4/15/13 11:07 AM

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bdw['ttbeck'/1642752, l='MpServer', x=255.52, y=95.62, z=1147.86]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (248,126,1155), Chunk: (at 8,7,3 in 15,72; contains blocks 240,0,1152 to 255,255,1167), Region: (0,2; contains chunks 0,64 to 31,95, blocks 0,0,1024 to 511,255,1535)
Level time: 48458 game time, 35921 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 17 total; [qn['Pig'/1642740, l='MpServer', x=234.31, y=94.00, z=1150.47], qi['Chicken'/1642741, l='MpServer', x=235.13, y=94.00, z=1151.06], sm['Villager'/1642742, l='MpServer', x=235.69, y=94.00, z=1150.31], qo['Sheep'/1642736, l='MpServer', x=222.00, y=84.00, z=1144.16], qo['Sheep'/1642737, l='MpServer', x=222.53, y=82.00, z=1149.53], qo['Sheep'/1642738, l='MpServer', x=222.31, y=83.00, z=1165.59], qo['Sheep'/1642739, l='MpServer', x=222.31, y=84.00, z=1167.91], qu['Wolf'/1642748, l='MpServer', x=246.31, y=94.00, z=1143.31], qu['Wolf'/1642749, l='MpServer', x=256.31, y=94.00, z=1149.31], rh['item.tile.sapling.oak'/1643029, l='MpServer', x=247.94, y=96.13, z=1135.28], bdw['ttbeck'/1642752, l='MpServer', x=255.52, y=95.62, z=1147.86], qn['Pig'/1642750, l='MpServer', x=241.50, y=106.00, z=1154.97], qn['Pig'/1642751, l='MpServer', x=276.47, y=85.00, z=1164.16], sm['Villager'/1642744, l='MpServer', x=226.88, y=88.00, z=1139.50], qj['Cow'/1642745, l='MpServer', x=235.19, y=104.00, z=1166.41], rh['item.tile.sapling.oak'/1642746, l='MpServer', x=244.50, y=96.13, z=1134.88], rh['item.tile.sapling.oak'/1642747, l='MpServer', x=242.47, y=99.13, z=1135.88]]
Retry entities: 0 total; []
Stacktrace:
at bdt.a(SourceFile:282)
at net.minecraft.client.Minecraft.b(SourceFile:1881)
at net.minecraft.client.Minecraft.run(SourceFile:535)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 1.5.1
Operating System: Windows Vista (x86) version 6.0
Java Version: 1.6.0_33, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
Memory: 234589864 bytes (223 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 238 (13328 bytes; 0 MB) allocated, 3 (168 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
LWJGL: 2.4.2
OpenGL: GeForce 6150SE nForce 430/PCI/SSE2/3DNOW! GL version 2.1.1, NVIDIA Corporation
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Easter Pack.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: 207 (11592 bytes; 0 MB) allocated, 31 (1736 bytes; 0 MB) used

java.lang.Throwable
at net.minecraft.client.Minecraft.l(SourceFile:1164)
at net.minecraft.client.Minecraft.K(SourceFile:574)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Unknown Source)
— END ERROR REPORT 736fe146 ----------