Amy ~

Go and CHECK in the garage and/or where vehicles SIT -
*Look* for any spilled fluids - other than oil.

Only takes a passing "lick" of AntiFreeze to make em REAL sick!

And ask the Folks - just to be SURE -
ANY Rat or other critter or BUG poisons put out??
If no one is *positive* - then search the house & garage.

Those "pet safe" plastic ANT Traps can cause problems IF
they get chewed upon.

Till you get to the bottom of this -
I'd suggest that he goes NOwhere unless ON Leash -
with a Human attached to the other end!

/s/ Phred