MySQL 8.0

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CREATE TABLE `animals` (
  `timestamp` datetime NOT NULL,
  `animal` tinytext NOT NULL,
  `comment` text NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `animals` (`timestamp`, `animal`, `comment`) VALUES
('2019-06-03 09:09:00', 'dog', 'good'),
('2019-06-03 12:00:00', 'cat', ''),
('2019-06-03 19:00:00', 'cat', ''),
('2019-07-04 09:00:00', 'cat', ''),
('2019-07-04 12:00:00', 'cat', 'feisty'),
('2019-07-04 18:51:00', 'dog', ''),
('2019-08-05 09:00:00', 'cat', ''),
('2019-08-05 12:00:00', 'cat', ''),
('2019-08-05 19:00:00', 'cat', ''),
('2019-09-06 09:00:00', 'cat', ' evil'),
('2019-09-06 12:00:00', 'cat', ''),
('2019-09-06 19:00:00', 'cat', '')
select 
    date_format(`timestamp`, '%Y-%m') `month`,
    sum(`animal` = 'dog') dog,
    sum(`animal` = 'cat') cat
from `animals` 
group by `month`
order by `month`


month
dog
cat


2019-06
1
2

2019-07
1
2

2019-08
0
3

2019-09
0
3