No offense, but you must not barbecue much
Steak is cooked rare at about 130 F. This means that the proteins in the meat have started to denature, losing their higher level structure. At 150 F (as any good BBQ-ist knows) fat starts to render...to melt. By 160 F, white meats are cooked through, steak is well done, and pretty much any bacteria (hi Salmonella) is neutralized.
The result of this heat is that no living organism can survive. The denaturing of the proteins is the key: if you want to have complex amino acids driving all sorts of complex internal systems, then you can't have your proteins changing shape and such. Having the lipids in your stored energy reserves melting isn't going to make things any better.
The conclusion here is that no creature can keep an internal temperature this high.
Is it reasonable for a creature to cool itself?
Lets say that you need your body temp at 120 F maximum to keep complex proteins intact (I don't know if that is reasonable or not). Is it reasonable for a creature to cool itself against those kinds of conditions?
Well, based on the life experience on Earth, the answer is no. Thermo-regulating mammals are able to control their body temperatures in the range of 95-110 F. The hottest place I can find on Earth is Ahvaz, Iran; with an average daily temp of 99 F in July. Basically, there is no record on Earth of a thermo-regulating animal living in a place where the average temperature is higher than its body temperature.
Extrapolating from that; if the cold conditions are 150 F and 150 F is going to cook your creature, then you cannot have advanced life forms live there.
Your creature must not have Earth's carbon-protein-fat based biochemistry.
Of course, once you do that, suggestions on what sort of chemistry and metablic processes to use could be endless. They are definitely a 'too broad' kind of question. So lets just leave it that Earth's biochemistry won't support an advanced creature living in those temperatures.
Note to haters: I'm specifically ignoring Pompeii worms and tardigrades and such that do survive at extreme temperatures, since they don't seem to bridge the gap to the OP's 'coyote-like' creature.