so my man Felix is 4 years old and fixed. normally he is content to sit and watch the world go by and play a bit with his brother Oscar (who is also 4 fixed and his littermate) or me with his wand toys or his plushie kick toys. However the past few days he seems to have a lot of extra pep and is trying to play more with his brother (I am 99.9% sure it is play as there is no hissing, growling, blood, puffy fur or avoiding of each other during the day). There is fair amount of chasing but it not long lasting-sorta starts and stops. It terms of who starts it I would say Felix starts the tussling 65% of the time and Oscar 35%. Is this normal/ok/something to be worried about? I also noticed that someone (unsure who) isn't always covering their pee the past few days (sometimes it is covered but sometimes the past few days it has not been and normally they are pretty good about covering their pee/poop). Is this connected/bad?