Today (12th april 2015) Tsuyoshi updated his jweb.
He said that his pet dog, ケンシロウ has passed away on 11th april
here's a rough translation of his jweb post
(sorry if theres any mistake in the translation)
11th april 4.49pm
Kenshirou has raise to the heaven.
Even till the last moment, he has been trying very hard waiting for me from far.
Then, he was in my arms till his last breath.
Probably he was struggling to stay alive until my birthday.
On my birthday, I'm to able celebrate with Kenshirou together with my family
He made me feel at ease to spend my birthday in everyone's laughter.
Kenshirou has taught me kindness and strength up until his very last moments
Thank you.
I have been hesitating that whether should I announce this piece of news. However, because of fans who has been watching over warmly towards Kenshirou over the years. I have come to a conclusion that I should tell everyone about it.
I want to let everyone know that even till his last moment, kenshirou has been warmly loving me with his little body.
Last year he had been through 2 major operations during my live and recording of shows.
He had strongly overcome it.
As compared to human age, Kenshirou is about 100 years old.
Because of the support from family, and every caring veterinarian. He was able to stay with me for a longer time after 2 major operation. And also, once again I have strongly felt the love for me and for kenshirou from fans over all the years.
Kenshirou and me thank everyone deep down in our hearts.
I have always felt the gratitude towards everyone and the sky whenever the time or a life has stopped.
Really, Thank you very much.
If Kenshirou appears in anyone's dream. Please give him a pat on his head.
I believe everyone has their own painful and bitter times, I am sorry to let everyone to hear mine.
Thank you for the love of all these time.
original text
It must be a very hard time for Tsuyoshi to lose his beloved kenshirou a day after his 36th birthday. Thank you kenshirou for giving Tsuyoshi lots of love and happy moments in the past 17 years. Please do bless him up in the heaven from now on. and also, I will give you a pat on your head and even a hug if you come to my dream.
Rest in peace, Kenshirou.