If you've installed Seasons, the bugs in the Pets patch no longer affect you, as they are present in the executable file. Seasons uses the Seasons executable.
Very good to know, thank you.
Only glitch so far, one of my Sims took the family kitten to work. (I expect this may be a pre-Seasons glitch that I haven't seen before.) Poor critter did come back when the Sim returned, still glued to the Sim's hand. His motives were pretty low by then, but he slept the rest of the day and recovered nicely.