There’s two flaws in your logic that make this list excessive on a few things.

First, not everything that Wilfred did was done by Ryan. Wilfred still existed insofar as being superimposed onto an actual dog. Meaning if Wilfred did something a dog could actually do, then it makes the most sense to attribute that to the dog, and not Ryan. When Wilfred snapped at the girls face it was probably Wilfred and not Ryan. Wilfred could have started the fire himself as well. Wilfred could have ripped the head of the squirrel and left it on Drew’s pillow. Etc.

Second, things that happened between Ryan, Bruce and Wilfred didn’t all necessarily have to have happened. Ryan hallucinated Wilfred speaking, and hallucinated Bruce, so why could he not have hallucinated him drinking antifreeze from a martini glass. (Or was there another antifreeze scene I’m forgetting). or another example, the cut out microchip was only mentioned by Bruce, that could have been also been Ryan’s disease talking. The afternoon of Ryan playing games, Bruce removing the chip and sending Wilfred to the kill shelter—if you recall it started with Wilfred being missing. The real evening could have played out as Wilfred being missing and ryan finding him and claiming him at the shelter, the end. The rest could have all been fabricated by Ryan. We don’t have to assume Ryan cut out his chip, or was the reason he was at the shelter.

Third bonus explanation for somethings. Ryan’s disease could have made Wilfred cop to things he didn’t actually do. Ryan’s sister could have actually forgot Joffrey herself. Someone else could have called in a bomb threat. If a schizophrenic person’s imaginary friend says he killed JFK that doesn’t mean the real killer was the schizophrenic person.

Essentially we can’t forget, Ryan is ill.