Need help with diagnosis- very strange problem

Tick disease most likely. Everytime we hunt one that has it their feet and legs will look like swollen marsh mellows. They won't eat. It gets to the point where it kills them eventually as it shuts down their kidneys. We've lost 10 plus dogs between us to tick diseases in last 8 years. We give doxycycline to put them in remission and help the dogs that have it but it's still a rough deal. Not sure if that's the case but have them run a tick assay on the dog that's still living. Be about $200 I believe

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