if you use /summon wolf ~ ~ ~ {Health:100f,Owner:[I;,,,],Attributes:[{Name:generic.max_health,Base:100}]} it will set the health to 20 no matter what you do with attributes. this is very annoying when making things with commands.
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Duplicate of MC-193202 - any attempt to set the nbt of a tamed wolf resets its health to 20, which is the cause of your issue.